TY  - JOUR
AU  - Stojanović, Branislav
AU  - Radović, Ljubica
AU  - Natić, Dejan
AU  - Dodevska, Margarita
AU  - Vrastanović-Pavicević, Gordana
AU  - Balaban, Milica
AU  - Stojanović, Zdenka
AU  - Antić, Vesna
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5362
AB  - The aim of this work was to assume the amount of BPA that can migrate to food packed into the cans coated by epoxy-phenolic lacquer. The assumption was made by determining the amount of BPA which migrates from the inner can coating to different food simulants: 3% acetic acid, 10% ethanol, their mixture (3% acetic acid +10% ethanol), and 50% ethanol. The examined tinplate cans were made by the special requirements of the Serbian Armed Forces. Further, the effect of the sterilization process and the very initial time of storage (15-105 days), on the level of BPA in the canned meatballs in tomato sauce, which are in the regular use of the Serbian Armed Forces, was examined. The BPA content was determined by the high performance liquid chromatography-mass spectrometry (HPLC-MS), and compared with BPA content found in the food simulants.
PB  - Wiley, Hoboken
T2  - Packaging Technology and Science
T1  - Migration of bisphenol a into food simulants and meat rations during initial time of storage
EP  - 82
IS  - 2
SP  - 75
VL  - 33
DO  - 10.1002/pts.2485
ER  - 

@article{
author = "Stojanović, Branislav and Radović, Ljubica and Natić, Dejan and Dodevska, Margarita and Vrastanović-Pavicević, Gordana and Balaban, Milica and Stojanović, Zdenka and Antić, Vesna",
year = "2020",
abstract = "The aim of this work was to assume the amount of BPA that can migrate to food packed into the cans coated by epoxy-phenolic lacquer. The assumption was made by determining the amount of BPA which migrates from the inner can coating to different food simulants: 3% acetic acid, 10% ethanol, their mixture (3% acetic acid +10% ethanol), and 50% ethanol. The examined tinplate cans were made by the special requirements of the Serbian Armed Forces. Further, the effect of the sterilization process and the very initial time of storage (15-105 days), on the level of BPA in the canned meatballs in tomato sauce, which are in the regular use of the Serbian Armed Forces, was examined. The BPA content was determined by the high performance liquid chromatography-mass spectrometry (HPLC-MS), and compared with BPA content found in the food simulants.",
publisher = "Wiley, Hoboken",
journal = "Packaging Technology and Science",
title = "Migration of bisphenol a into food simulants and meat rations during initial time of storage",
pages = "82-75",
number = "2",
volume = "33",
doi = "10.1002/pts.2485"
}

Stojanović, B., Radović, L., Natić, D., Dodevska, M., Vrastanović-Pavicević, G., Balaban, M., Stojanović, Z.,& Antić, V.. (2020). Migration of bisphenol a into food simulants and meat rations during initial time of storage. in Packaging Technology and Science
Wiley, Hoboken., 33(2), 75-82.
https://doi.org/10.1002/pts.2485

Stojanović B, Radović L, Natić D, Dodevska M, Vrastanović-Pavicević G, Balaban M, Stojanović Z, Antić V. Migration of bisphenol a into food simulants and meat rations during initial time of storage. in Packaging Technology and Science. 2020;33(2):75-82.
doi:10.1002/pts.2485 .

Stojanović, Branislav, Radović, Ljubica, Natić, Dejan, Dodevska, Margarita, Vrastanović-Pavicević, Gordana, Balaban, Milica, Stojanović, Zdenka, Antić, Vesna, "Migration of bisphenol a into food simulants and meat rations during initial time of storage" in Packaging Technology and Science, 33, no. 2 (2020):75-82,
https://doi.org/10.1002/pts.2485 . .

TY  - JOUR
AU  - Stojanović, Branislav
AU  - Radović, Ljubica
AU  - Natić, Dejan
AU  - Dodevska, Margarita
AU  - Vrastanović-Pavicević, Gordana
AU  - Balaban, Milica
AU  - Lević, Steva
AU  - Petrović, Tanja
AU  - Antić, Vesna
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5031
AB  - The migration of bisphenol A (BPA) from epoxy-phenolic can coating into canned meat products, produced for the needs of the Serbian Armed Forces, was investigated in this work. The tinplate cans were made according to the special military demands, filled with the beef goulash or the meatballs in tomato sauce, and preserved by sterilization. The structure of internal can coating was analyzed by FTIR spectroscopy. The migration of BPA into content of the cans was investigated after storage under regular conditions in typical military facilities. The samples of beef goulash (BG) produced in 2010-2016, and the meatballs in tomato sauce (MB) produced in 2014-2017 were tested for the presence of BPA. Thereafter, the impact of storage temperature and degree of can damage on BPA migration was examined. Both meat products were thermostated on 20 and 40 degrees C, and BPA level was measured after 3, 6, 9 and 12 months of storage. The level of BPA was determined in the content of undamaged cans, and cans with lower and higher degree of damage. The BPA was extracted from food with acetonitrile and the extracts were purified by QuEChERS procedure. The level of BPA was determined by LC-MS.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Influence of a storage conditions on migration of bisphenol A from epoxy-phenolic coating to canned meat products
EP  - 389
IS  - 4
SP  - 377
VL  - 84
DO  - 10.2298/JSC181015100S
ER  - 

@article{
author = "Stojanović, Branislav and Radović, Ljubica and Natić, Dejan and Dodevska, Margarita and Vrastanović-Pavicević, Gordana and Balaban, Milica and Lević, Steva and Petrović, Tanja and Antić, Vesna",
year = "2019",
abstract = "The migration of bisphenol A (BPA) from epoxy-phenolic can coating into canned meat products, produced for the needs of the Serbian Armed Forces, was investigated in this work. The tinplate cans were made according to the special military demands, filled with the beef goulash or the meatballs in tomato sauce, and preserved by sterilization. The structure of internal can coating was analyzed by FTIR spectroscopy. The migration of BPA into content of the cans was investigated after storage under regular conditions in typical military facilities. The samples of beef goulash (BG) produced in 2010-2016, and the meatballs in tomato sauce (MB) produced in 2014-2017 were tested for the presence of BPA. Thereafter, the impact of storage temperature and degree of can damage on BPA migration was examined. Both meat products were thermostated on 20 and 40 degrees C, and BPA level was measured after 3, 6, 9 and 12 months of storage. The level of BPA was determined in the content of undamaged cans, and cans with lower and higher degree of damage. The BPA was extracted from food with acetonitrile and the extracts were purified by QuEChERS procedure. The level of BPA was determined by LC-MS.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Influence of a storage conditions on migration of bisphenol A from epoxy-phenolic coating to canned meat products",
pages = "389-377",
number = "4",
volume = "84",
doi = "10.2298/JSC181015100S"
}

Stojanović, B., Radović, L., Natić, D., Dodevska, M., Vrastanović-Pavicević, G., Balaban, M., Lević, S., Petrović, T.,& Antić, V.. (2019). Influence of a storage conditions on migration of bisphenol A from epoxy-phenolic coating to canned meat products. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 84(4), 377-389.
https://doi.org/10.2298/JSC181015100S

Stojanović B, Radović L, Natić D, Dodevska M, Vrastanović-Pavicević G, Balaban M, Lević S, Petrović T, Antić V. Influence of a storage conditions on migration of bisphenol A from epoxy-phenolic coating to canned meat products. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2019;84(4):377-389.
doi:10.2298/JSC181015100S .

Stojanović, Branislav, Radović, Ljubica, Natić, Dejan, Dodevska, Margarita, Vrastanović-Pavicević, Gordana, Balaban, Milica, Lević, Steva, Petrović, Tanja, Antić, Vesna, "Influence of a storage conditions on migration of bisphenol A from epoxy-phenolic coating to canned meat products" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 84, no. 4 (2019):377-389,
https://doi.org/10.2298/JSC181015100S . .

TY  - JOUR
AU  - Tomić, Milos
AU  - Dunjić, Branko
AU  - Nikolić, Marija S.
AU  - Trifković, Kata
AU  - Stanković, Nadezda
AU  - Pavlović, Vladimir
AU  - Bajat, Jelena
AU  - Djonlagić, Jasna
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5068
AB  - In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite (R) Na+) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved.
PB  - Elsevier Science Sa, Lausanne
T2  - Progress in Organic Coatings
T1  - Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites
EP  - 321
SP  - 311
VL  - 131
DO  - 10.1016/j.porgcoat.2019.02.037
ER  - 

@article{
author = "Tomić, Milos and Dunjić, Branko and Nikolić, Marija S. and Trifković, Kata and Stanković, Nadezda and Pavlović, Vladimir and Bajat, Jelena and Djonlagić, Jasna",
year = "2019",
abstract = "In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite (R) Na+) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Progress in Organic Coatings",
title = "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites",
pages = "321-311",
volume = "131",
doi = "10.1016/j.porgcoat.2019.02.037"
}

Tomić, M., Dunjić, B., Nikolić, M. S., Trifković, K., Stanković, N., Pavlović, V., Bajat, J.,& Djonlagić, J.. (2019). Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings
Elsevier Science Sa, Lausanne., 131, 311-321.
https://doi.org/10.1016/j.porgcoat.2019.02.037

Tomić M, Dunjić B, Nikolić MS, Trifković K, Stanković N, Pavlović V, Bajat J, Djonlagić J. Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings. 2019;131:311-321.
doi:10.1016/j.porgcoat.2019.02.037 .

Tomić, Milos, Dunjić, Branko, Nikolić, Marija S., Trifković, Kata, Stanković, Nadezda, Pavlović, Vladimir, Bajat, Jelena, Djonlagić, Jasna, "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites" in Progress in Organic Coatings, 131 (2019):311-321,
https://doi.org/10.1016/j.porgcoat.2019.02.037 . .

TY  - JOUR
AU  - Tomić, Milog
AU  - Dunjić, Branko
AU  - Nikolić, Marija S.
AU  - Maletaskić, Jelena
AU  - Pavlović, Vladimir
AU  - Bajat, Jelena
AU  - Djonlagić, Jasna
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4750
AB  - The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly dispersed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G', G", of Mt/epoxy dispersions and glassy storage modulus, Young's modulus and barrier properties of cured CPN.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Clay Science
T1  - Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods
EP  - 63
SP  - 52
VL  - 154
DO  - 10.1016/j.clay.2017.12.047
ER  - 

@article{
author = "Tomić, Milog and Dunjić, Branko and Nikolić, Marija S. and Maletaskić, Jelena and Pavlović, Vladimir and Bajat, Jelena and Djonlagić, Jasna",
year = "2018",
abstract = "The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly dispersed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G', G", of Mt/epoxy dispersions and glassy storage modulus, Young's modulus and barrier properties of cured CPN.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Clay Science",
title = "Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods",
pages = "63-52",
volume = "154",
doi = "10.1016/j.clay.2017.12.047"
}

Tomić, M., Dunjić, B., Nikolić, M. S., Maletaskić, J., Pavlović, V., Bajat, J.,& Djonlagić, J.. (2018). Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods. in Applied Clay Science
Elsevier Science Bv, Amsterdam., 154, 52-63.
https://doi.org/10.1016/j.clay.2017.12.047

Tomić M, Dunjić B, Nikolić MS, Maletaskić J, Pavlović V, Bajat J, Djonlagić J. Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods. in Applied Clay Science. 2018;154:52-63.
doi:10.1016/j.clay.2017.12.047 .

Tomić, Milog, Dunjić, Branko, Nikolić, Marija S., Maletaskić, Jelena, Pavlović, Vladimir, Bajat, Jelena, Djonlagić, Jasna, "Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods" in Applied Clay Science, 154 (2018):52-63,
https://doi.org/10.1016/j.clay.2017.12.047 . .

TY  - JOUR
AU  - Marković, Bojana M.
AU  - Vuković, Zorica M.
AU  - Spasojević, Vojislav V.
AU  - Kusigerski, Vladan B.
AU  - Pavlović, Vladimir
AU  - Onjia, Antonije E.
AU  - Nastasović, Aleksandra B.
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4383
AB  - Magnetic macroporous crosslinked copolymer glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EGDMA) samples with different magnetite content were prepared by suspension copolymerization and functionalized with diethylene triamine. Samples were characterized by elemental analysis, mercury porosimetry, Fourier transform infrared spectroscopy (FTIR) analysis, scanning electron microscopy with energy-dispersive X-ray spectroscopy, transmission electron microscopy, SQUID magnetometry and X-ray photoelectron spectroscopy (XPS). The selected amino-functionalized sample was tested as a potential sorbent for the Mo(VI) and Re(VII) oxyanions from aqueous solutions. The influence of pH, ionic strength and possible interfering of cations and anions was investigated. Equilibrium data were analyzed with Langmuir, Freundlich and Tempkin adsorption isotherm models. Sorption studies were carried out in a batch competitive experiments, in the pH range 1-8, at 298 K. Obtained results indicate that 92% of Re(VII) and 98% of Mo(VI) were sorbed at pH 2.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Alloys and Compounds
T1  - Selective magnetic GMA based potential sorbents for molybdenum and rhenium sorption
EP  - 50
SP  - 38
VL  - 705
DO  - 10.1016/j.jallcom.2017.02.108
ER  - 

@article{
author = "Marković, Bojana M. and Vuković, Zorica M. and Spasojević, Vojislav V. and Kusigerski, Vladan B. and Pavlović, Vladimir and Onjia, Antonije E. and Nastasović, Aleksandra B.",
year = "2017",
abstract = "Magnetic macroporous crosslinked copolymer glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EGDMA) samples with different magnetite content were prepared by suspension copolymerization and functionalized with diethylene triamine. Samples were characterized by elemental analysis, mercury porosimetry, Fourier transform infrared spectroscopy (FTIR) analysis, scanning electron microscopy with energy-dispersive X-ray spectroscopy, transmission electron microscopy, SQUID magnetometry and X-ray photoelectron spectroscopy (XPS). The selected amino-functionalized sample was tested as a potential sorbent for the Mo(VI) and Re(VII) oxyanions from aqueous solutions. The influence of pH, ionic strength and possible interfering of cations and anions was investigated. Equilibrium data were analyzed with Langmuir, Freundlich and Tempkin adsorption isotherm models. Sorption studies were carried out in a batch competitive experiments, in the pH range 1-8, at 298 K. Obtained results indicate that 92% of Re(VII) and 98% of Mo(VI) were sorbed at pH 2.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "Selective magnetic GMA based potential sorbents for molybdenum and rhenium sorption",
pages = "50-38",
volume = "705",
doi = "10.1016/j.jallcom.2017.02.108"
}

Marković, B. M., Vuković, Z. M., Spasojević, V. V., Kusigerski, V. B., Pavlović, V., Onjia, A. E.,& Nastasović, A. B.. (2017). Selective magnetic GMA based potential sorbents for molybdenum and rhenium sorption. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 705, 38-50.
https://doi.org/10.1016/j.jallcom.2017.02.108

Marković BM, Vuković ZM, Spasojević VV, Kusigerski VB, Pavlović V, Onjia AE, Nastasović AB. Selective magnetic GMA based potential sorbents for molybdenum and rhenium sorption. in Journal of Alloys and Compounds. 2017;705:38-50.
doi:10.1016/j.jallcom.2017.02.108 .

Marković, Bojana M., Vuković, Zorica M., Spasojević, Vojislav V., Kusigerski, Vladan B., Pavlović, Vladimir, Onjia, Antonije E., Nastasović, Aleksandra B., "Selective magnetic GMA based potential sorbents for molybdenum and rhenium sorption" in Journal of Alloys and Compounds, 705 (2017):38-50,
https://doi.org/10.1016/j.jallcom.2017.02.108 . .

TY  - JOUR
AU  - Tasić, Aleksandra M.
AU  - Pergal, Marija V.
AU  - Antić, Mališa
AU  - Antić, Vesna
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4437
AB  - A series of alpha,omega-telechelic polydimethylsiloxanes (PDMS), with predetermined molecular weights of about 2500 g mol(-1), was synthesized by siloxane equilibration reaction. Syntheses were performed using octamethylcyclotetrasiloxane (D-4) and various disiloxanes: hexamethyldisiloxane (HMDS), 1,1,3,3-tetramethyldisiloxane (TMDS), 1,3-divinyltetramethyldisiloxane (DVTMDS), 1,3-bis(3-carboxypropyl) tetramethyldisiloxane (DCPTMDS) and 1,3-bis(3-aminopropyl) tetramethyldisiloxane (DAPTMDS). The role of the disiloxane was to introduce terminal functional groups at the end of the polymer chains and to control the molecular weight of the polymers. Polymers with trimethyl, hydrido, vinyl, carboxypropyl and aminopropyl end-groups were obtained in this way. The structure of the alpha,omega-telechelic PDMSs was confirmed by NMR and IR spectroscopy. The molecular weights of the polymers were determined by H-1-NMR, gel permeation chromatography (GPC) and dilute solution viscometry. Thermogravimetric analysis (TGA) under nitrogen and air showed that the type of the terminal groups significantly influenced the thermal and thermo-oxidative stability, as well as the degradation mechanism of the alpha,omega-telechelic PDMSs.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Synthesis, structure and thermogravimetric analysis of alpha,omega-telechelic polydimethylsiloxanes of low molecular weight
EP  - 1416
IS  - 12
SP  - 1395
VL  - 82
DO  - 10.2298/JSC170427082T
ER  - 

@article{
author = "Tasić, Aleksandra M. and Pergal, Marija V. and Antić, Mališa and Antić, Vesna",
year = "2017",
abstract = "A series of alpha,omega-telechelic polydimethylsiloxanes (PDMS), with predetermined molecular weights of about 2500 g mol(-1), was synthesized by siloxane equilibration reaction. Syntheses were performed using octamethylcyclotetrasiloxane (D-4) and various disiloxanes: hexamethyldisiloxane (HMDS), 1,1,3,3-tetramethyldisiloxane (TMDS), 1,3-divinyltetramethyldisiloxane (DVTMDS), 1,3-bis(3-carboxypropyl) tetramethyldisiloxane (DCPTMDS) and 1,3-bis(3-aminopropyl) tetramethyldisiloxane (DAPTMDS). The role of the disiloxane was to introduce terminal functional groups at the end of the polymer chains and to control the molecular weight of the polymers. Polymers with trimethyl, hydrido, vinyl, carboxypropyl and aminopropyl end-groups were obtained in this way. The structure of the alpha,omega-telechelic PDMSs was confirmed by NMR and IR spectroscopy. The molecular weights of the polymers were determined by H-1-NMR, gel permeation chromatography (GPC) and dilute solution viscometry. Thermogravimetric analysis (TGA) under nitrogen and air showed that the type of the terminal groups significantly influenced the thermal and thermo-oxidative stability, as well as the degradation mechanism of the alpha,omega-telechelic PDMSs.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Synthesis, structure and thermogravimetric analysis of alpha,omega-telechelic polydimethylsiloxanes of low molecular weight",
pages = "1416-1395",
number = "12",
volume = "82",
doi = "10.2298/JSC170427082T"
}

Tasić, A. M., Pergal, M. V., Antić, M.,& Antić, V.. (2017). Synthesis, structure and thermogravimetric analysis of alpha,omega-telechelic polydimethylsiloxanes of low molecular weight. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 82(12), 1395-1416.
https://doi.org/10.2298/JSC170427082T

Tasić AM, Pergal MV, Antić M, Antić V. Synthesis, structure and thermogravimetric analysis of alpha,omega-telechelic polydimethylsiloxanes of low molecular weight. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2017;82(12):1395-1416.
doi:10.2298/JSC170427082T .

Tasić, Aleksandra M., Pergal, Marija V., Antić, Mališa, Antić, Vesna, "Synthesis, structure and thermogravimetric analysis of alpha,omega-telechelic polydimethylsiloxanes of low molecular weight" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 82, no. 12 (2017):1395-1416,
https://doi.org/10.2298/JSC170427082T . .

TY  - JOUR
AU  - Stefanović, Ivan S.
AU  - Spirkova, Milena
AU  - Ostojić, Sanja
AU  - Stefanov, Plamen
AU  - Pavlović, Vladimir
AU  - Pergal, Marija V.
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4486
AB  - The aim of this work was to prepare and characterize the series of segmented polyurethane nanocomposites (PUNC) modified with poly(dimethylsiloxane) and based on montmorillonite (Mt) as a nano-filler. alpha,omega-Dihydroxy-poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) macrodiol was used as the soft segment component, while 4,4'-diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BD) were selected as the hard segment components. PUNC were synthesized with different ratio of hard/soft segments. PUNC were morphologically, structurally, thermally, mechanically and surface characterized by XRD, TEM, FTIR, AFM, TGA, DMTA, tensile test, XPS, contact angle, surface free energy (SFE) and water absorption measurements. Added Mt (1 wt%) was completely delaminated and well dispersed in the form of mixed exfoliated/intercalated layers in the polymer matrix, and that PUNC have more pronounced microphase separated morphology, higher thermal stability, superior mechanical features, enhanced surface properties, as well as outstanding hydrophobicity. Due to the improved features, developed polymers can be considered as candidates for materials with specific biomedical applications or as waterproof coatings.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Clay Science
T1  - Montmorillonite/poly(urethane-siloxane) nanocomposites: Morphological, thermal, mechanical and surface properties
EP  - 146
SP  - 136
VL  - 149
DO  - 10.1016/j.clay.2017.08.021
ER  - 

@article{
author = "Stefanović, Ivan S. and Spirkova, Milena and Ostojić, Sanja and Stefanov, Plamen and Pavlović, Vladimir and Pergal, Marija V.",
year = "2017",
abstract = "The aim of this work was to prepare and characterize the series of segmented polyurethane nanocomposites (PUNC) modified with poly(dimethylsiloxane) and based on montmorillonite (Mt) as a nano-filler. alpha,omega-Dihydroxy-poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) macrodiol was used as the soft segment component, while 4,4'-diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BD) were selected as the hard segment components. PUNC were synthesized with different ratio of hard/soft segments. PUNC were morphologically, structurally, thermally, mechanically and surface characterized by XRD, TEM, FTIR, AFM, TGA, DMTA, tensile test, XPS, contact angle, surface free energy (SFE) and water absorption measurements. Added Mt (1 wt%) was completely delaminated and well dispersed in the form of mixed exfoliated/intercalated layers in the polymer matrix, and that PUNC have more pronounced microphase separated morphology, higher thermal stability, superior mechanical features, enhanced surface properties, as well as outstanding hydrophobicity. Due to the improved features, developed polymers can be considered as candidates for materials with specific biomedical applications or as waterproof coatings.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Clay Science",
title = "Montmorillonite/poly(urethane-siloxane) nanocomposites: Morphological, thermal, mechanical and surface properties",
pages = "146-136",
volume = "149",
doi = "10.1016/j.clay.2017.08.021"
}

Stefanović, I. S., Spirkova, M., Ostojić, S., Stefanov, P., Pavlović, V.,& Pergal, M. V.. (2017). Montmorillonite/poly(urethane-siloxane) nanocomposites: Morphological, thermal, mechanical and surface properties. in Applied Clay Science
Elsevier Science Bv, Amsterdam., 149, 136-146.
https://doi.org/10.1016/j.clay.2017.08.021

Stefanović IS, Spirkova M, Ostojić S, Stefanov P, Pavlović V, Pergal MV. Montmorillonite/poly(urethane-siloxane) nanocomposites: Morphological, thermal, mechanical and surface properties. in Applied Clay Science. 2017;149:136-146.
doi:10.1016/j.clay.2017.08.021 .

Stefanović, Ivan S., Spirkova, Milena, Ostojić, Sanja, Stefanov, Plamen, Pavlović, Vladimir, Pergal, Marija V., "Montmorillonite/poly(urethane-siloxane) nanocomposites: Morphological, thermal, mechanical and surface properties" in Applied Clay Science, 149 (2017):136-146,
https://doi.org/10.1016/j.clay.2017.08.021 . .

TY  - JOUR
AU  - Stefanović, Ivan S.
AU  - Djonlagić, Jasna
AU  - Tovilović, Gordana
AU  - Nestorov, Jelena
AU  - Antić, Vesna
AU  - Ostojić, Sanja
AU  - Pergal, Marija V.
PY  - 2015
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3799
AB  - Polyurethane copolymers based on ,-dihydroxypropyl poly(dimethylsiloxane) (PDMS) with a range of soft segment contents were prepared by two-stage polymerization, and their microstructures, thermal, thermomechanical, and surface properties, as well as in vitro hemo- and cytocompatibility were evaluated. All utilized characterization methods confirmed the existence of moderately microphase separated structures with the appearance of some microphase mixing between segments as the PDMS (i.e., soft segment) content increased. Copolymers showed higher crystallinity, storage moduli, surface roughness, and surface free energy, but less hydrophobicity with decreasing PDMS content. Biocompatibility of copolymers was evaluated using an endothelial EA.hy926 cell line by direct contact, an extraction method and after pretreatment of copolymers with multicomponent protein mixture, as well as by a competitive protein adsorption assay. Copolymers showed no toxic effect to endothelial cells and all copolymers, except that with the lowest PDMS content, exhibited resistance to endothelial cell adhesion, suggesting their unsuitability for long-term biomedical devices which particularly require re-endothelialization. All copolymers exhibited excellent resistance to fibrinogen adsorption and adsorbed more albumin than fibrinogen in the competitive adsorption assay, suggesting their good hemocompatibility. The noncytotoxic chemistry of these synthesized materials, combined with their nonadherent properties which are inhospitable to cell attachment and growth, underlie the need for further investigations to clarify their potential for use in short-term biomedical devices.
PB  - Wiley-Blackwell, Hoboken
T2  - Journal of Biomedical Materials Research Part A
T1  - Poly(urethane-dimethylsiloxane) copolymers displaying a range of soft segment contents, noncytotoxic chemistry, and nonadherent properties toward endothelial cells
EP  - 1475
IS  - 4
SP  - 1459
VL  - 103
DO  - 10.1002/jbm.a.35285
ER  - 

@article{
author = "Stefanović, Ivan S. and Djonlagić, Jasna and Tovilović, Gordana and Nestorov, Jelena and Antić, Vesna and Ostojić, Sanja and Pergal, Marija V.",
year = "2015",
abstract = "Polyurethane copolymers based on ,-dihydroxypropyl poly(dimethylsiloxane) (PDMS) with a range of soft segment contents were prepared by two-stage polymerization, and their microstructures, thermal, thermomechanical, and surface properties, as well as in vitro hemo- and cytocompatibility were evaluated. All utilized characterization methods confirmed the existence of moderately microphase separated structures with the appearance of some microphase mixing between segments as the PDMS (i.e., soft segment) content increased. Copolymers showed higher crystallinity, storage moduli, surface roughness, and surface free energy, but less hydrophobicity with decreasing PDMS content. Biocompatibility of copolymers was evaluated using an endothelial EA.hy926 cell line by direct contact, an extraction method and after pretreatment of copolymers with multicomponent protein mixture, as well as by a competitive protein adsorption assay. Copolymers showed no toxic effect to endothelial cells and all copolymers, except that with the lowest PDMS content, exhibited resistance to endothelial cell adhesion, suggesting their unsuitability for long-term biomedical devices which particularly require re-endothelialization. All copolymers exhibited excellent resistance to fibrinogen adsorption and adsorbed more albumin than fibrinogen in the competitive adsorption assay, suggesting their good hemocompatibility. The noncytotoxic chemistry of these synthesized materials, combined with their nonadherent properties which are inhospitable to cell attachment and growth, underlie the need for further investigations to clarify their potential for use in short-term biomedical devices.",
publisher = "Wiley-Blackwell, Hoboken",
journal = "Journal of Biomedical Materials Research Part A",
title = "Poly(urethane-dimethylsiloxane) copolymers displaying a range of soft segment contents, noncytotoxic chemistry, and nonadherent properties toward endothelial cells",
pages = "1475-1459",
number = "4",
volume = "103",
doi = "10.1002/jbm.a.35285"
}

Stefanović, I. S., Djonlagić, J., Tovilović, G., Nestorov, J., Antić, V., Ostojić, S.,& Pergal, M. V.. (2015). Poly(urethane-dimethylsiloxane) copolymers displaying a range of soft segment contents, noncytotoxic chemistry, and nonadherent properties toward endothelial cells. in Journal of Biomedical Materials Research Part A
Wiley-Blackwell, Hoboken., 103(4), 1459-1475.
https://doi.org/10.1002/jbm.a.35285

Stefanović IS, Djonlagić J, Tovilović G, Nestorov J, Antić V, Ostojić S, Pergal MV. Poly(urethane-dimethylsiloxane) copolymers displaying a range of soft segment contents, noncytotoxic chemistry, and nonadherent properties toward endothelial cells. in Journal of Biomedical Materials Research Part A. 2015;103(4):1459-1475.
doi:10.1002/jbm.a.35285 .

Stefanović, Ivan S., Djonlagić, Jasna, Tovilović, Gordana, Nestorov, Jelena, Antić, Vesna, Ostojić, Sanja, Pergal, Marija V., "Poly(urethane-dimethylsiloxane) copolymers displaying a range of soft segment contents, noncytotoxic chemistry, and nonadherent properties toward endothelial cells" in Journal of Biomedical Materials Research Part A, 103, no. 4 (2015):1459-1475,
https://doi.org/10.1002/jbm.a.35285 . .

TY  - JOUR
AU  - Pergal, Marija V.
AU  - Stefanović, Ivan S.
AU  - Godjevac, Dejan
AU  - Antić, Vesna
AU  - Milacić, Vesna
AU  - Ostojić, Sanja
AU  - Rogan, Jelena
AU  - Djonlagić, Jasna
PY  - 2014
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3399
AB  - In this study, the synthesis, structure and physical properties of two series of thermoplastic polyurethanes based on hydroxypropyl-terminated poly(dimethylsiloxane) (HP-PDMS) or hydroxyethoxypropyl-terminated poly(dimethylsiloxane) (EO-PDMS) as soft segments, and 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol as hard segments were investigated. The polyurethanes were synthesized by two-step polyaddition in solution. The effects of the type and content of PDMS segments on the structure, thermal and surface properties of copolymers were studied by H-1-, C-13-nuclear magnetic resonance (NMR) spectroscopy and two-dimensional NMR spectroscopies (heteronuclear multiple bond correlation (HMBC) and rotating-frame nuclear Overhauser effect (ROESY)), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), wide-angle X-ray scattering (WAXS), scanning electron microscopy (SEM) and water contact angle and water absorption measurements. Thermal properties investigated by DSC indicated that the presence of soft PDMS segments lowers the glass transition and melting temperatures of the hard phase as well as the degree of crystallinity. SEM analysis of the copolymers with a lower soft segment content confirmed the presence of spherulite superstructures, which arise from the crystallization of the hard segments. When compared with polyurethanes prepared from HP-PDMS, the copolymers synthesized from EO-PDMS with the same content of the soft segments had a higher degree of crystallinity, better thermal stability and a less hydrophobic surface. The obtained results showed that the synthesized polyurethanes had good thermal and surface properties, which could be further modified by changing the type or content of the soft segments.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Structural, thermal and surface characterization of thermoplastic polyurethanes based on poly(dimethylsiloxane)
EP  - +
IS  - 7
SP  - 843
VL  - 79
DO  - 10.2298/JSC130819149P
ER  - 

@article{
author = "Pergal, Marija V. and Stefanović, Ivan S. and Godjevac, Dejan and Antić, Vesna and Milacić, Vesna and Ostojić, Sanja and Rogan, Jelena and Djonlagić, Jasna",
year = "2014",
abstract = "In this study, the synthesis, structure and physical properties of two series of thermoplastic polyurethanes based on hydroxypropyl-terminated poly(dimethylsiloxane) (HP-PDMS) or hydroxyethoxypropyl-terminated poly(dimethylsiloxane) (EO-PDMS) as soft segments, and 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol as hard segments were investigated. The polyurethanes were synthesized by two-step polyaddition in solution. The effects of the type and content of PDMS segments on the structure, thermal and surface properties of copolymers were studied by H-1-, C-13-nuclear magnetic resonance (NMR) spectroscopy and two-dimensional NMR spectroscopies (heteronuclear multiple bond correlation (HMBC) and rotating-frame nuclear Overhauser effect (ROESY)), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), wide-angle X-ray scattering (WAXS), scanning electron microscopy (SEM) and water contact angle and water absorption measurements. Thermal properties investigated by DSC indicated that the presence of soft PDMS segments lowers the glass transition and melting temperatures of the hard phase as well as the degree of crystallinity. SEM analysis of the copolymers with a lower soft segment content confirmed the presence of spherulite superstructures, which arise from the crystallization of the hard segments. When compared with polyurethanes prepared from HP-PDMS, the copolymers synthesized from EO-PDMS with the same content of the soft segments had a higher degree of crystallinity, better thermal stability and a less hydrophobic surface. The obtained results showed that the synthesized polyurethanes had good thermal and surface properties, which could be further modified by changing the type or content of the soft segments.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Structural, thermal and surface characterization of thermoplastic polyurethanes based on poly(dimethylsiloxane)",
pages = "+-843",
number = "7",
volume = "79",
doi = "10.2298/JSC130819149P"
}

Pergal, M. V., Stefanović, I. S., Godjevac, D., Antić, V., Milacić, V., Ostojić, S., Rogan, J.,& Djonlagić, J.. (2014). Structural, thermal and surface characterization of thermoplastic polyurethanes based on poly(dimethylsiloxane). in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 79(7), 843-+.
https://doi.org/10.2298/JSC130819149P

Pergal MV, Stefanović IS, Godjevac D, Antić V, Milacić V, Ostojić S, Rogan J, Djonlagić J. Structural, thermal and surface characterization of thermoplastic polyurethanes based on poly(dimethylsiloxane). in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2014;79(7):843-+.
doi:10.2298/JSC130819149P .

Pergal, Marija V., Stefanović, Ivan S., Godjevac, Dejan, Antić, Vesna, Milacić, Vesna, Ostojić, Sanja, Rogan, Jelena, Djonlagić, Jasna, "Structural, thermal and surface characterization of thermoplastic polyurethanes based on poly(dimethylsiloxane)" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 79, no. 7 (2014):843-+,
https://doi.org/10.2298/JSC130819149P . .

TY  - JOUR
AU  - Trifković, Kata
AU  - Milasinović, Nikola Z.
AU  - Djordjević, Verica B.
AU  - Kalagasidis-Krusić, Melina T.
AU  - Knežević-Jugović, Zorica
AU  - Nedović, Viktor
AU  - Bugarski, Branko
PY  - 2014
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3430
AB  - In this work chitosan microbeads were prepared by emulsion technique and loaded with thyme polyphenols by diffusion from an external aqueous solution of Thymus serpyllum L. The effects of concentrations of chitosan (1.5-3% (w/v)) and GA (glutaraldehyde) (0.1-0.4% (v/v)), as a crosslinking agent on the main properties of microbeads were assessed. The obtained microgel beads from similar to 220 to similar to 790 mu m in diameter were exposed to controlled drying process at air (at 37 degrees C) after which they contracted to irregular shapes (similar to 70-230 mu m). The loading of dried microbeads with polyphenols was achieved by swelling in the acidic medium. The swelling rate of microbeads decreased with the increase in GA concentration. Upon this rehydration, thyme polypheriols were effectively encapsulated (active load of 66-114mg GAEg(beads)(-1)) and the microbeads recovered a spherical shape. Both, the increase in the amount of the crosslinking agent and the presence of polyphenols, contributed to a more pronounced surface roughness of microbeads. The release of encapsulated polyphenols in simulated gastrointestinal fluids was prolonged to 3 h.
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Chitosan microbeads for encapsulation of thyme (Thymus serpyllum L.) polyphenols
EP  - 907
SP  - 901
VL  - 111
DO  - 10.1016/j.carbpol.2014.05.053
ER  - 

@article{
author = "Trifković, Kata and Milasinović, Nikola Z. and Djordjević, Verica B. and Kalagasidis-Krusić, Melina T. and Knežević-Jugović, Zorica and Nedović, Viktor and Bugarski, Branko",
year = "2014",
abstract = "In this work chitosan microbeads were prepared by emulsion technique and loaded with thyme polyphenols by diffusion from an external aqueous solution of Thymus serpyllum L. The effects of concentrations of chitosan (1.5-3% (w/v)) and GA (glutaraldehyde) (0.1-0.4% (v/v)), as a crosslinking agent on the main properties of microbeads were assessed. The obtained microgel beads from similar to 220 to similar to 790 mu m in diameter were exposed to controlled drying process at air (at 37 degrees C) after which they contracted to irregular shapes (similar to 70-230 mu m). The loading of dried microbeads with polyphenols was achieved by swelling in the acidic medium. The swelling rate of microbeads decreased with the increase in GA concentration. Upon this rehydration, thyme polypheriols were effectively encapsulated (active load of 66-114mg GAEg(beads)(-1)) and the microbeads recovered a spherical shape. Both, the increase in the amount of the crosslinking agent and the presence of polyphenols, contributed to a more pronounced surface roughness of microbeads. The release of encapsulated polyphenols in simulated gastrointestinal fluids was prolonged to 3 h.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Chitosan microbeads for encapsulation of thyme (Thymus serpyllum L.) polyphenols",
pages = "907-901",
volume = "111",
doi = "10.1016/j.carbpol.2014.05.053"
}

Trifković, K., Milasinović, N. Z., Djordjević, V. B., Kalagasidis-Krusić, M. T., Knežević-Jugović, Z., Nedović, V.,& Bugarski, B.. (2014). Chitosan microbeads for encapsulation of thyme (Thymus serpyllum L.) polyphenols. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 111, 901-907.
https://doi.org/10.1016/j.carbpol.2014.05.053

Trifković K, Milasinović NZ, Djordjević VB, Kalagasidis-Krusić MT, Knežević-Jugović Z, Nedović V, Bugarski B. Chitosan microbeads for encapsulation of thyme (Thymus serpyllum L.) polyphenols. in Carbohydrate Polymers. 2014;111:901-907.
doi:10.1016/j.carbpol.2014.05.053 .

Trifković, Kata, Milasinović, Nikola Z., Djordjević, Verica B., Kalagasidis-Krusić, Melina T., Knežević-Jugović, Zorica, Nedović, Viktor, Bugarski, Branko, "Chitosan microbeads for encapsulation of thyme (Thymus serpyllum L.) polyphenols" in Carbohydrate Polymers, 111 (2014):901-907,
https://doi.org/10.1016/j.carbpol.2014.05.053 . .

TY  - JOUR
AU  - Balaban, Milica
AU  - Antić, Vesna
AU  - Pergal, Marija V.
AU  - Godjevac, Dejan
AU  - Francolini, Iolanda
AU  - Martinelli, Andrea
AU  - Rogan, Jelena
AU  - Djonlagić, Jasna
PY  - 2013
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3294
AB  - Segmented poly(urethane-urea-siloxane)s (PUUS) were synthesized using 4,4'-methylenediphenyl diisocyanate (MDI) and ethylene diamine (ED) as the hard segment components and hydroxypropyl-terminated poly(dimethylsiloxane) (PDMS) as the soft segment component, where the hard segment content ranged from 38 to 65 wt%. Segmented PUUSs were prepared by a two-step polymerization procedure in tetrahydrofuran/N-methylpyrrolidone (THF/NMP) mixture with a large proportion of polar solvent. The structure, composition and hard segment length were determined by C-13 NMR and two-dimensional correlation spectroscopy. Thermal, mechanical, small-angle X-ray scattering and hydrogen bonding analyses indicated the formation of the microphase-separated copolymers with high tensile strength. Globular superstructures observed in the copolymer films by scanning electron microscopy (SEM) and atomic force microscopy (AFM) were probably arisen from the microstructural organization of the MDI-ED segments, depending on their content and length. The PUUS copolymers showed high water resistance and became more hydrophobic with increasing weight fraction of PDMS.
PB  - Springer, New York
T2  - Polymer Bulletin
T1  - Influence of the chemical structure of poly(urea-urethane-siloxane)s on their morphological, surface and thermal properties
EP  - 2518
IS  - 9
SP  - 2493
VL  - 70
DO  - 10.1007/s00289-013-0968-2
ER  - 

@article{
author = "Balaban, Milica and Antić, Vesna and Pergal, Marija V. and Godjevac, Dejan and Francolini, Iolanda and Martinelli, Andrea and Rogan, Jelena and Djonlagić, Jasna",
year = "2013",
abstract = "Segmented poly(urethane-urea-siloxane)s (PUUS) were synthesized using 4,4'-methylenediphenyl diisocyanate (MDI) and ethylene diamine (ED) as the hard segment components and hydroxypropyl-terminated poly(dimethylsiloxane) (PDMS) as the soft segment component, where the hard segment content ranged from 38 to 65 wt%. Segmented PUUSs were prepared by a two-step polymerization procedure in tetrahydrofuran/N-methylpyrrolidone (THF/NMP) mixture with a large proportion of polar solvent. The structure, composition and hard segment length were determined by C-13 NMR and two-dimensional correlation spectroscopy. Thermal, mechanical, small-angle X-ray scattering and hydrogen bonding analyses indicated the formation of the microphase-separated copolymers with high tensile strength. Globular superstructures observed in the copolymer films by scanning electron microscopy (SEM) and atomic force microscopy (AFM) were probably arisen from the microstructural organization of the MDI-ED segments, depending on their content and length. The PUUS copolymers showed high water resistance and became more hydrophobic with increasing weight fraction of PDMS.",
publisher = "Springer, New York",
journal = "Polymer Bulletin",
title = "Influence of the chemical structure of poly(urea-urethane-siloxane)s on their morphological, surface and thermal properties",
pages = "2518-2493",
number = "9",
volume = "70",
doi = "10.1007/s00289-013-0968-2"
}

Balaban, M., Antić, V., Pergal, M. V., Godjevac, D., Francolini, I., Martinelli, A., Rogan, J.,& Djonlagić, J.. (2013). Influence of the chemical structure of poly(urea-urethane-siloxane)s on their morphological, surface and thermal properties. in Polymer Bulletin
Springer, New York., 70(9), 2493-2518.
https://doi.org/10.1007/s00289-013-0968-2

Balaban M, Antić V, Pergal MV, Godjevac D, Francolini I, Martinelli A, Rogan J, Djonlagić J. Influence of the chemical structure of poly(urea-urethane-siloxane)s on their morphological, surface and thermal properties. in Polymer Bulletin. 2013;70(9):2493-2518.
doi:10.1007/s00289-013-0968-2 .

Balaban, Milica, Antić, Vesna, Pergal, Marija V., Godjevac, Dejan, Francolini, Iolanda, Martinelli, Andrea, Rogan, Jelena, Djonlagić, Jasna, "Influence of the chemical structure of poly(urea-urethane-siloxane)s on their morphological, surface and thermal properties" in Polymer Bulletin, 70, no. 9 (2013):2493-2518,
https://doi.org/10.1007/s00289-013-0968-2 . .

TY  - JOUR
AU  - Antić, Vesna
AU  - Antić, Mališa
AU  - Kronimus, Alexander
AU  - Schwarzbauer, Jan
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2920
AB  - 'On-line' pyrolysis coupled with gas chromatography (GC) was performed for quantitative determination of poly(vinylpyrrolidone) (PVP) in wastewater sample. Gas chromatography-mass spectrometry (GC-MS) showed that the main product of pyrolysis of PVP, at high temperatures, was N-vinylpyrrolidone (NVP). After that, different amounts of commercial PVP were pyrolyzed in order to establish the correlation between the amount of generated NVP (its GC peak area) and the initial mass of pyrolyzed PVP. GC-FID analysis was used for construction of the calibration curve and for quantitative determination of PVP. Very good linear correlation was obtained between the area of NVP peak, generated during pyrolysis, and the initial mass of PVP (r2 = 0.998). Further, solutions of known concentration of PVP were prepared in destilled water ('spiked samples'). Spiked samples were preextracted with diethyl ether and n-hexane, after which the water-layer was evaporated and dissolved again in methanol. Analysis of pyrolysates of preextracted spiked samples showed that the 'recovery' of PVP was above 96 mass%. This finding suggested that pre-extraction could be applied to reduce the concentration of organic substances that could also be pyrolyzed, and thus hinder identification and quantitative determination of PVP, without significant loss of polymer. The sample of an industrial wastewater from Pančevo, Serbia was investigated in the last part of this work. The sample was preextracted in the same way as the spiked samples and than pyrolyzed. NVP was identified by GC-MS in obtained pyrolysate, which was the evidence that PVP was present in the wastewater sample. NVP was quantified on the basis of the peak area in GC-FID chromatogram, and than the concentration of PVP in wastewater sample was calculated based on calibration curve. Concentration of PVP in industrial wastewater amounted 2.5 mg/L.
AB  - U ovom radu je primenjena metoda 'on-line' pirolize u sprezi sa gasnom hromatografijom (GC) za kvantitativno određivanje poli(vinilpirolidona) (PVP) u uzorku otpadne vode. Najpre je gasnomhromatografsko-masenospektrometrijskom analizom (GC-MS) utvrđeno da pirolizom PVP na visokim temperaturama kao glavni proizvod degradacije nastaje monomer, N-vinilpirolidon (NVP). Nakon toga su različite količine komercijalnog PVP pirolizovane da bi se uspostavila korelacija između količine nastalog NVP i inicijalne mase pirolizovanog polimera. Za konstruisanje kalibracione krive i kvantitativno određivanje PVP u rastvorima poznate koncentracije u destilovanoj vodi ('spiked samples'), kao i u uzorku otpadne vode, korišćena je GC analiza. Analizom rastvora komercijalnog PVP poznate koncentracije ustanovljeno je da PVP 'recovery', nakon ekstrakcije n-heksanom i dietil-etrom, iznosi iznad 96 mas.%. U poslednjem delu rada ispitan je uzorak industrijske otpadne vode iz Pančeva, Srbija. Pokazano je da je PVP bio prisutan u otpadnoj vodi i da je njegova koncentracija bila daleko iznad uobičajenih koncentracija niskomolekularnih organskih zagađivača.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Quantitative determination of poly(vinylpyrrolidone) by 'On-line' pyrolysis coupled with gas chromatography
T1  - Kvantitativno određivanje poli(vinilpirolidona) primenom 'On-line' pirolize kuplovane sa gasnom hromatografijom
EP  - 364
IS  - 3
SP  - 357
VL  - 66
DO  - 10.2298/HEMIND111114108A
ER  - 

@article{
author = "Antić, Vesna and Antić, Mališa and Kronimus, Alexander and Schwarzbauer, Jan",
year = "2012",
abstract = "'On-line' pyrolysis coupled with gas chromatography (GC) was performed for quantitative determination of poly(vinylpyrrolidone) (PVP) in wastewater sample. Gas chromatography-mass spectrometry (GC-MS) showed that the main product of pyrolysis of PVP, at high temperatures, was N-vinylpyrrolidone (NVP). After that, different amounts of commercial PVP were pyrolyzed in order to establish the correlation between the amount of generated NVP (its GC peak area) and the initial mass of pyrolyzed PVP. GC-FID analysis was used for construction of the calibration curve and for quantitative determination of PVP. Very good linear correlation was obtained between the area of NVP peak, generated during pyrolysis, and the initial mass of PVP (r2 = 0.998). Further, solutions of known concentration of PVP were prepared in destilled water ('spiked samples'). Spiked samples were preextracted with diethyl ether and n-hexane, after which the water-layer was evaporated and dissolved again in methanol. Analysis of pyrolysates of preextracted spiked samples showed that the 'recovery' of PVP was above 96 mass%. This finding suggested that pre-extraction could be applied to reduce the concentration of organic substances that could also be pyrolyzed, and thus hinder identification and quantitative determination of PVP, without significant loss of polymer. The sample of an industrial wastewater from Pančevo, Serbia was investigated in the last part of this work. The sample was preextracted in the same way as the spiked samples and than pyrolyzed. NVP was identified by GC-MS in obtained pyrolysate, which was the evidence that PVP was present in the wastewater sample. NVP was quantified on the basis of the peak area in GC-FID chromatogram, and than the concentration of PVP in wastewater sample was calculated based on calibration curve. Concentration of PVP in industrial wastewater amounted 2.5 mg/L., U ovom radu je primenjena metoda 'on-line' pirolize u sprezi sa gasnom hromatografijom (GC) za kvantitativno određivanje poli(vinilpirolidona) (PVP) u uzorku otpadne vode. Najpre je gasnomhromatografsko-masenospektrometrijskom analizom (GC-MS) utvrđeno da pirolizom PVP na visokim temperaturama kao glavni proizvod degradacije nastaje monomer, N-vinilpirolidon (NVP). Nakon toga su različite količine komercijalnog PVP pirolizovane da bi se uspostavila korelacija između količine nastalog NVP i inicijalne mase pirolizovanog polimera. Za konstruisanje kalibracione krive i kvantitativno određivanje PVP u rastvorima poznate koncentracije u destilovanoj vodi ('spiked samples'), kao i u uzorku otpadne vode, korišćena je GC analiza. Analizom rastvora komercijalnog PVP poznate koncentracije ustanovljeno je da PVP 'recovery', nakon ekstrakcije n-heksanom i dietil-etrom, iznosi iznad 96 mas.%. U poslednjem delu rada ispitan je uzorak industrijske otpadne vode iz Pančeva, Srbija. Pokazano je da je PVP bio prisutan u otpadnoj vodi i da je njegova koncentracija bila daleko iznad uobičajenih koncentracija niskomolekularnih organskih zagađivača.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Quantitative determination of poly(vinylpyrrolidone) by 'On-line' pyrolysis coupled with gas chromatography, Kvantitativno određivanje poli(vinilpirolidona) primenom 'On-line' pirolize kuplovane sa gasnom hromatografijom",
pages = "364-357",
number = "3",
volume = "66",
doi = "10.2298/HEMIND111114108A"
}

Antić, V., Antić, M., Kronimus, A.,& Schwarzbauer, J.. (2012). Quantitative determination of poly(vinylpyrrolidone) by 'On-line' pyrolysis coupled with gas chromatography. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 66(3), 357-364.
https://doi.org/10.2298/HEMIND111114108A

Antić V, Antić M, Kronimus A, Schwarzbauer J. Quantitative determination of poly(vinylpyrrolidone) by 'On-line' pyrolysis coupled with gas chromatography. in Hemijska industrija. 2012;66(3):357-364.
doi:10.2298/HEMIND111114108A .

Antić, Vesna, Antić, Mališa, Kronimus, Alexander, Schwarzbauer, Jan, "Quantitative determination of poly(vinylpyrrolidone) by 'On-line' pyrolysis coupled with gas chromatography" in Hemijska industrija, 66, no. 3 (2012):357-364,
https://doi.org/10.2298/HEMIND111114108A . .

TY  - JOUR
AU  - Pergal, Marija V.
AU  - Antić, Vesna
AU  - Tovilović, Gordana
AU  - Nestorov, Jelena
AU  - Vasiljević-Radović, Dana
AU  - Djonlagić, Jasna
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2954
AB  - Novel polyurethane co-polymers (TPUs), based on poly(epsilon-caprolactone)-block-poly(dimethylsiloxane)-block-poly(epsilon-caprolactone) (PCL-PDMS-PCL) as soft segment and 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BD) as hard segment, were synthesized and evaluated for biomedical applications. The content of hard segments (HS) in the polymer chains was varied from 9 to 63 wt%. The influence of the content and length of the HS on the thermal, surface, mechanical properties and biocompatibility was investigated. The structure, composition and HS length were examined using H-1- and quantitative C-13-NMR spectroscopy. DSC results implied that the synthesized TPUs were semicrystalline polymers in which both the hard MDI/BD and soft PCL-PDMS-PCL segments participated. It was found that an increase in the average HS length (from 1.2 to 14.4 MDI/BD units) was accompanied by an increase in the crystallinity of the hard segments, storage moduli, hydrophilicity and degree of microphase separation of the co-polymers. Depending on the HS content, a gradual variation in surface properties of co-polymers was revealed by FTIR, AFM and static water contact angle measurements. The in vitro biocompatibility of co-polymers was evaluated using the endothelial EA. hy926 cell line and protein adsorption on the polyurethane films. All synthesized TPUs adsorbed more albumin than fibrinogen from multicomponent protein mixture, which may indicate biocompatibility. The polyurethane films with high HS content and/or high roughness coefficient exhibit good surface properties and biocompatible behavior, which was confirmed by non-toxic effects to cells and good cell adhesion. Therefore, the non-cytotoxic chemistry of the co-polymers makes them good candidates for further development as biomedical implants.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Journal of Biomaterials Science-Polymer Edition
T1  - In Vitro Biocompatibility Evaluation of Novel Urethane-Siloxane Co-Polymers Based on Poly(epsilon-Caprolactone)-block-Poly(Dimethylsiloxane)-block-Poly(epsilon-Caprolactone)
EP  - 1657
IS  - 13
SP  - 1629
VL  - 23
DO  - 10.1163/092050611X589338
ER  - 

@article{
author = "Pergal, Marija V. and Antić, Vesna and Tovilović, Gordana and Nestorov, Jelena and Vasiljević-Radović, Dana and Djonlagić, Jasna",
year = "2012",
abstract = "Novel polyurethane co-polymers (TPUs), based on poly(epsilon-caprolactone)-block-poly(dimethylsiloxane)-block-poly(epsilon-caprolactone) (PCL-PDMS-PCL) as soft segment and 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BD) as hard segment, were synthesized and evaluated for biomedical applications. The content of hard segments (HS) in the polymer chains was varied from 9 to 63 wt%. The influence of the content and length of the HS on the thermal, surface, mechanical properties and biocompatibility was investigated. The structure, composition and HS length were examined using H-1- and quantitative C-13-NMR spectroscopy. DSC results implied that the synthesized TPUs were semicrystalline polymers in which both the hard MDI/BD and soft PCL-PDMS-PCL segments participated. It was found that an increase in the average HS length (from 1.2 to 14.4 MDI/BD units) was accompanied by an increase in the crystallinity of the hard segments, storage moduli, hydrophilicity and degree of microphase separation of the co-polymers. Depending on the HS content, a gradual variation in surface properties of co-polymers was revealed by FTIR, AFM and static water contact angle measurements. The in vitro biocompatibility of co-polymers was evaluated using the endothelial EA. hy926 cell line and protein adsorption on the polyurethane films. All synthesized TPUs adsorbed more albumin than fibrinogen from multicomponent protein mixture, which may indicate biocompatibility. The polyurethane films with high HS content and/or high roughness coefficient exhibit good surface properties and biocompatible behavior, which was confirmed by non-toxic effects to cells and good cell adhesion. Therefore, the non-cytotoxic chemistry of the co-polymers makes them good candidates for further development as biomedical implants.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Journal of Biomaterials Science-Polymer Edition",
title = "In Vitro Biocompatibility Evaluation of Novel Urethane-Siloxane Co-Polymers Based on Poly(epsilon-Caprolactone)-block-Poly(Dimethylsiloxane)-block-Poly(epsilon-Caprolactone)",
pages = "1657-1629",
number = "13",
volume = "23",
doi = "10.1163/092050611X589338"
}

Pergal, M. V., Antić, V., Tovilović, G., Nestorov, J., Vasiljević-Radović, D.,& Djonlagić, J.. (2012). In Vitro Biocompatibility Evaluation of Novel Urethane-Siloxane Co-Polymers Based on Poly(epsilon-Caprolactone)-block-Poly(Dimethylsiloxane)-block-Poly(epsilon-Caprolactone). in Journal of Biomaterials Science-Polymer Edition
Taylor & Francis Ltd, Abingdon., 23(13), 1629-1657.
https://doi.org/10.1163/092050611X589338

Pergal MV, Antić V, Tovilović G, Nestorov J, Vasiljević-Radović D, Djonlagić J. In Vitro Biocompatibility Evaluation of Novel Urethane-Siloxane Co-Polymers Based on Poly(epsilon-Caprolactone)-block-Poly(Dimethylsiloxane)-block-Poly(epsilon-Caprolactone). in Journal of Biomaterials Science-Polymer Edition. 2012;23(13):1629-1657.
doi:10.1163/092050611X589338 .

Pergal, Marija V., Antić, Vesna, Tovilović, Gordana, Nestorov, Jelena, Vasiljević-Radović, Dana, Djonlagić, Jasna, "In Vitro Biocompatibility Evaluation of Novel Urethane-Siloxane Co-Polymers Based on Poly(epsilon-Caprolactone)-block-Poly(Dimethylsiloxane)-block-Poly(epsilon-Caprolactone)" in Journal of Biomaterials Science-Polymer Edition, 23, no. 13 (2012):1629-1657,
https://doi.org/10.1163/092050611X589338 . .

TY  - JOUR
AU  - Balaban, Milica
AU  - Antić, Vesna
AU  - Pergal, Marija V.
AU  - Francolini, Iolanda
AU  - Martinelli, Andrea
AU  - Djonlagić, Jasna
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2969
AB  - Segmented poly(urethane-urea-siloxanes) (PUUS) based on 4,4'- methylene diphenyl diisocyanate-ethylene diamine (MDI-ED) hard segments and hydroxypropyl-terminated poly(dimethylsiloxane) (PDMS, Mn = 1000 g mol-1) soft segments were prepared under various experimental conditions. The copolymers with constant molar ratio of hard and soft segments (PDMS:MDI:ED = 1:2:1; 20 wt. % of the hard segments) were synthesized in two different solvent mixtures, by a two-step polyaddition procedure. The first one was tetrahydrofuran/N,N-dimethylacetamide (THF/DMAc) with different co-solvent ratios (1/1, 1/2 and 1/9, v/v), whereas the second one was tetrahydrofuran/N-methylpyrrolidone (THF/NMP, 1/9, v/v). The reaction conditions were optimized by varying the co-solvents ratio, the concentration of the catalyst, the initial monomer concentration, as well as the time of the first and the second step of the reaction. The effects of the experimental conditions on the size of the PUUS were investigated by gel permeation chromatography (GPC) and dilute solution viscometry. The copolymers with the highest molecular weights were obtained in the THF/NMP mixture (1/9, v/v). The structure and composition of the copolymers were determined by 1H-NMR and FTIR spectroscopy. The morphology of the synthesized copolymers was investigated by atomic force microscopy (AFM), while the thermal properties were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The surface properties were evaluated by measuring the water contact angle (WCA). The copolymers exhibited phase-separated microstructure and were stable up to 200°C in nitrogen.
AB  - Segmentirani poli(uretan-urea-siloksani) (PUUS), sa tvrdim segmentima na bazi 4,4'-metilendifenildiizocijanata i etilendiamina (MDI-ED) i mekim segmentima na bazi hidroksipropil-terminiranog poli(dimetilsiloksana) (PDMS, Mn = 1000 g mol-1), sintetisani su pod različitim eksperimentalnim uslovima. Kopolimeri sa konstantnim molskim odnosom tvrdih i mekih segmenata (PDMS:MDI:ED = 1:2:1; 20 mas. % tvrdih segmenata), sintetisani su u dve različite smeše rastvarača kao reakcionog medijuma, metodom dvostepene poliadicije. Prva kombinacija rastvarača je bila smeša tetrahidrofurana (THF) i N,N-dimetilacetamida (DMAc), dok je u drugom slučaju korišćena smeša THF-a i N-metilpirolidona (NMP). Reakcioni uslovi su optimizovani u pogledu odnosa ko-rastvarača, koncentracije katalizatora, početne koncentracije monomera i vremena odigravanja prve i druge faze reakcije. Ispitan je uticaj primenjenih eksperimentalnih uslova na veličinu PUUS primenom gel-propusne hromatografije (GPC) i viskozimetrije razblaženih rastvora [η]. Kopolimeri najvećih molarnih masa su dobijeni u smeši THF/NMP (1/9, v/v). Struktura i sastav kopolimera su okarakterisani 1H-NMR i FTIR spektroskopijom. Morfologija sintetisanih kopolimera je ispitana mikroskopijom atomskih sila (AFM), dok su termička svojstva ispitana diferencijalnom skenirajućom kalorimetrijom (DSC) i termogravimetrijskom analizom (TGA). Površinska svojstva kopolimera su ispitana određivanjem kontaktnih uglova sa vodom (WCA). Kopolimeri su pokazali dvofaznu mikrostrukturu i bili su stabilni do 200°C u atmosteri azota.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - The effect of polar solvents on the synthesis of poly(urethane-urea-siloxane)s
T1  - Uticaj polarnih rastvarača na sintezu poli(uretan-urea-siloksana)
EP  - 1481
IS  - 10
SP  - 1457
VL  - 77
DO  - 10.2298/JSC111025056B
ER  - 

@article{
author = "Balaban, Milica and Antić, Vesna and Pergal, Marija V. and Francolini, Iolanda and Martinelli, Andrea and Djonlagić, Jasna",
year = "2012",
abstract = "Segmented poly(urethane-urea-siloxanes) (PUUS) based on 4,4'- methylene diphenyl diisocyanate-ethylene diamine (MDI-ED) hard segments and hydroxypropyl-terminated poly(dimethylsiloxane) (PDMS, Mn = 1000 g mol-1) soft segments were prepared under various experimental conditions. The copolymers with constant molar ratio of hard and soft segments (PDMS:MDI:ED = 1:2:1; 20 wt. % of the hard segments) were synthesized in two different solvent mixtures, by a two-step polyaddition procedure. The first one was tetrahydrofuran/N,N-dimethylacetamide (THF/DMAc) with different co-solvent ratios (1/1, 1/2 and 1/9, v/v), whereas the second one was tetrahydrofuran/N-methylpyrrolidone (THF/NMP, 1/9, v/v). The reaction conditions were optimized by varying the co-solvents ratio, the concentration of the catalyst, the initial monomer concentration, as well as the time of the first and the second step of the reaction. The effects of the experimental conditions on the size of the PUUS were investigated by gel permeation chromatography (GPC) and dilute solution viscometry. The copolymers with the highest molecular weights were obtained in the THF/NMP mixture (1/9, v/v). The structure and composition of the copolymers were determined by 1H-NMR and FTIR spectroscopy. The morphology of the synthesized copolymers was investigated by atomic force microscopy (AFM), while the thermal properties were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The surface properties were evaluated by measuring the water contact angle (WCA). The copolymers exhibited phase-separated microstructure and were stable up to 200°C in nitrogen., Segmentirani poli(uretan-urea-siloksani) (PUUS), sa tvrdim segmentima na bazi 4,4'-metilendifenildiizocijanata i etilendiamina (MDI-ED) i mekim segmentima na bazi hidroksipropil-terminiranog poli(dimetilsiloksana) (PDMS, Mn = 1000 g mol-1), sintetisani su pod različitim eksperimentalnim uslovima. Kopolimeri sa konstantnim molskim odnosom tvrdih i mekih segmenata (PDMS:MDI:ED = 1:2:1; 20 mas. % tvrdih segmenata), sintetisani su u dve različite smeše rastvarača kao reakcionog medijuma, metodom dvostepene poliadicije. Prva kombinacija rastvarača je bila smeša tetrahidrofurana (THF) i N,N-dimetilacetamida (DMAc), dok je u drugom slučaju korišćena smeša THF-a i N-metilpirolidona (NMP). Reakcioni uslovi su optimizovani u pogledu odnosa ko-rastvarača, koncentracije katalizatora, početne koncentracije monomera i vremena odigravanja prve i druge faze reakcije. Ispitan je uticaj primenjenih eksperimentalnih uslova na veličinu PUUS primenom gel-propusne hromatografije (GPC) i viskozimetrije razblaženih rastvora [η]. Kopolimeri najvećih molarnih masa su dobijeni u smeši THF/NMP (1/9, v/v). Struktura i sastav kopolimera su okarakterisani 1H-NMR i FTIR spektroskopijom. Morfologija sintetisanih kopolimera je ispitana mikroskopijom atomskih sila (AFM), dok su termička svojstva ispitana diferencijalnom skenirajućom kalorimetrijom (DSC) i termogravimetrijskom analizom (TGA). Površinska svojstva kopolimera su ispitana određivanjem kontaktnih uglova sa vodom (WCA). Kopolimeri su pokazali dvofaznu mikrostrukturu i bili su stabilni do 200°C u atmosteri azota.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "The effect of polar solvents on the synthesis of poly(urethane-urea-siloxane)s, Uticaj polarnih rastvarača na sintezu poli(uretan-urea-siloksana)",
pages = "1481-1457",
number = "10",
volume = "77",
doi = "10.2298/JSC111025056B"
}

Balaban, M., Antić, V., Pergal, M. V., Francolini, I., Martinelli, A.,& Djonlagić, J.. (2012). The effect of polar solvents on the synthesis of poly(urethane-urea-siloxane)s. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 77(10), 1457-1481.
https://doi.org/10.2298/JSC111025056B

Balaban M, Antić V, Pergal MV, Francolini I, Martinelli A, Djonlagić J. The effect of polar solvents on the synthesis of poly(urethane-urea-siloxane)s. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2012;77(10):1457-1481.
doi:10.2298/JSC111025056B .

Balaban, Milica, Antić, Vesna, Pergal, Marija V., Francolini, Iolanda, Martinelli, Andrea, Djonlagić, Jasna, "The effect of polar solvents on the synthesis of poly(urethane-urea-siloxane)s" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 77, no. 10 (2012):1457-1481,
https://doi.org/10.2298/JSC111025056B . .

TY  - JOUR
AU  - Pergal, Marija V.
AU  - Antić, Vesna
AU  - Ostojić, Sanja
AU  - Marinović-Cincović, Milena
AU  - Djonlagić, Jasna
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2697
AB  - A series of novel thermoplastic urethane-siloxane copolymers (TPUSs) based on a α,ω-dihydroxy-[poly(ε-caprolactone)-b-poly(dimethylsiloxane)-b- -poly(ε-caprolactone)] (α,ω-dihydroxy-PCL-PDMS-PCL) triblock copolymer, 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BD) was synthesized. The effects of the content (9-63 mass %) of hard urethane segments and their degree of polymerization on the properties of the segmented TPUSs were investigated. The structure, composition and hard segment degree of polymerization of the hard segments were examined using 1H- and quantitative 13C-NMR spectroscopy. The degree of crystallinity of the synthesized copolymers was determined using wide-angle X-ray scattering (WAXS). The surface properties were evaluated by measuring the water contact angle and water absorption. In the series of the TPUSs, the average degree of polymerization of the hard segments was varied from 1.2 to 14.4 MDI-BD units. It was found that average values from 3.8 to 14.4 MDI-BD units were effective segment lengths for crystallization of hard segments, which resulted in an increase in the degree of microphase separation of the copolymers. Spherulite-like superstructures were observed in copolymer films by scanning electron microscopy (SEM), which are believed to arise from the crystallization of the hard segments and/or PCL segments, depending on the content of the hard segments. The surface of the copolymers became more hydrophobic with increasing weight fraction of PDMS. The synthesized copolymers based on a PCL-PDMS-PCL segment showed good thermal stability, which increased with increasing content of soft PDMS segments, as was confirmed by the value of the starting temperature of thermal degradation.
AB  - U ovom radu prikazana je struktura i neka svojstva serije novih termoplastičnih uretan-siloksanskih kopolimera (TPUSs) na bazi α,ω-dihidroksi-[poli(ε-kaprolakton)-b-poli(dimetilsiloksan)-b-poli(ε-kaprolakton)] triblok kopolimera (α,ω-dihidroksi-PCL-PDMS-PCL), 4,4'-metilendifenildiizocijanata (MDI) i 1,4-butandiola (BD). Ispitan je uticaj sadržaja uretanskog tvrdog segmenta (9-63 mas. %) i njegove dužine, tj. stepena polimerizacije, izražene preko broja MDI-BD ostataka, na svojstva segmentiranih TPUSs. Struktura, sastav i stepen polimerizacije tvrdog segmenta su ispitani pomoću 1H- i kvantitativne 13C-NMR spektroskopije. Stepen kristaliničnosti kopolimera je određen metodom difrakcije X-zraka na velikim uglovima (WAXS). Površinska svojstva kopolimera su ispitana određivanjem kontaktnih uglova sa vodom i merenjem apsorpcije vode. U seriji kopolimera dužina tvrdog segmenta izražena preko broja ponavljajućih MDI-BD jedinica je varirana od 1,2 do 14,4. Utvrđeno je da tvrdi segmenti sa 3,8 do 14,4 ponavljajućih MDI-BD jedinica efikasno kristališu, što je rezultovalo u povećanju stepena mikrofazne separacije kopolimera. SEM analiza je pokazala prisustvo sferulitne strukture u kopolimernim filmovima, koja najverovatnije potiče od kristalizacije tvrdih i/ili PCL segmenata, zavisno od sadržaja tvrdih segmenata. Hidrofobnost površine kopolimera je rasla sa povećanjem masenog udela PDMS-a u odgovarajućem uzorku. Sintetisani poliuretani na bazi PCL-PDMS-PCL pokazuju povećanje termičke stabilnosti sa povećanjem sadržaja mekih PDMS segmenata, što je potvrđeno porastom početne temperature degradacije, određene TG analizom.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Influence of the content of hard segments on the properties of novel urethane-siloxane copolymers based on a poly(ε-caprolactone)-b-poly(dimethylsiloxane)-b-poly(ε-caprolactone) triblock copolymer
T1  - Uticaj sadržaja tvrdog segmenta na svojstva novih uretan-siloksanskih kopolimera na bazi poli(e-kaprolakton)-b-poli(dimetilsiloksan)-b-poli(e-kaprolaktona)
EP  - 1723
IS  - 12
SP  - 1703
VL  - 76
DO  - 10.2298/JSC110307146P
ER  - 

@article{
author = "Pergal, Marija V. and Antić, Vesna and Ostojić, Sanja and Marinović-Cincović, Milena and Djonlagić, Jasna",
year = "2011",
abstract = "A series of novel thermoplastic urethane-siloxane copolymers (TPUSs) based on a α,ω-dihydroxy-[poly(ε-caprolactone)-b-poly(dimethylsiloxane)-b- -poly(ε-caprolactone)] (α,ω-dihydroxy-PCL-PDMS-PCL) triblock copolymer, 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BD) was synthesized. The effects of the content (9-63 mass %) of hard urethane segments and their degree of polymerization on the properties of the segmented TPUSs were investigated. The structure, composition and hard segment degree of polymerization of the hard segments were examined using 1H- and quantitative 13C-NMR spectroscopy. The degree of crystallinity of the synthesized copolymers was determined using wide-angle X-ray scattering (WAXS). The surface properties were evaluated by measuring the water contact angle and water absorption. In the series of the TPUSs, the average degree of polymerization of the hard segments was varied from 1.2 to 14.4 MDI-BD units. It was found that average values from 3.8 to 14.4 MDI-BD units were effective segment lengths for crystallization of hard segments, which resulted in an increase in the degree of microphase separation of the copolymers. Spherulite-like superstructures were observed in copolymer films by scanning electron microscopy (SEM), which are believed to arise from the crystallization of the hard segments and/or PCL segments, depending on the content of the hard segments. The surface of the copolymers became more hydrophobic with increasing weight fraction of PDMS. The synthesized copolymers based on a PCL-PDMS-PCL segment showed good thermal stability, which increased with increasing content of soft PDMS segments, as was confirmed by the value of the starting temperature of thermal degradation., U ovom radu prikazana je struktura i neka svojstva serije novih termoplastičnih uretan-siloksanskih kopolimera (TPUSs) na bazi α,ω-dihidroksi-[poli(ε-kaprolakton)-b-poli(dimetilsiloksan)-b-poli(ε-kaprolakton)] triblok kopolimera (α,ω-dihidroksi-PCL-PDMS-PCL), 4,4'-metilendifenildiizocijanata (MDI) i 1,4-butandiola (BD). Ispitan je uticaj sadržaja uretanskog tvrdog segmenta (9-63 mas. %) i njegove dužine, tj. stepena polimerizacije, izražene preko broja MDI-BD ostataka, na svojstva segmentiranih TPUSs. Struktura, sastav i stepen polimerizacije tvrdog segmenta su ispitani pomoću 1H- i kvantitativne 13C-NMR spektroskopije. Stepen kristaliničnosti kopolimera je određen metodom difrakcije X-zraka na velikim uglovima (WAXS). Površinska svojstva kopolimera su ispitana određivanjem kontaktnih uglova sa vodom i merenjem apsorpcije vode. U seriji kopolimera dužina tvrdog segmenta izražena preko broja ponavljajućih MDI-BD jedinica je varirana od 1,2 do 14,4. Utvrđeno je da tvrdi segmenti sa 3,8 do 14,4 ponavljajućih MDI-BD jedinica efikasno kristališu, što je rezultovalo u povećanju stepena mikrofazne separacije kopolimera. SEM analiza je pokazala prisustvo sferulitne strukture u kopolimernim filmovima, koja najverovatnije potiče od kristalizacije tvrdih i/ili PCL segmenata, zavisno od sadržaja tvrdih segmenata. Hidrofobnost površine kopolimera je rasla sa povećanjem masenog udela PDMS-a u odgovarajućem uzorku. Sintetisani poliuretani na bazi PCL-PDMS-PCL pokazuju povećanje termičke stabilnosti sa povećanjem sadržaja mekih PDMS segmenata, što je potvrđeno porastom početne temperature degradacije, određene TG analizom.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Influence of the content of hard segments on the properties of novel urethane-siloxane copolymers based on a poly(ε-caprolactone)-b-poly(dimethylsiloxane)-b-poly(ε-caprolactone) triblock copolymer, Uticaj sadržaja tvrdog segmenta na svojstva novih uretan-siloksanskih kopolimera na bazi poli(e-kaprolakton)-b-poli(dimetilsiloksan)-b-poli(e-kaprolaktona)",
pages = "1723-1703",
number = "12",
volume = "76",
doi = "10.2298/JSC110307146P"
}

Pergal, M. V., Antić, V., Ostojić, S., Marinović-Cincović, M.,& Djonlagić, J.. (2011). Influence of the content of hard segments on the properties of novel urethane-siloxane copolymers based on a poly(ε-caprolactone)-b-poly(dimethylsiloxane)-b-poly(ε-caprolactone) triblock copolymer. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 76(12), 1703-1723.
https://doi.org/10.2298/JSC110307146P

Pergal MV, Antić V, Ostojić S, Marinović-Cincović M, Djonlagić J. Influence of the content of hard segments on the properties of novel urethane-siloxane copolymers based on a poly(ε-caprolactone)-b-poly(dimethylsiloxane)-b-poly(ε-caprolactone) triblock copolymer. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2011;76(12):1703-1723.
doi:10.2298/JSC110307146P .

Pergal, Marija V., Antić, Vesna, Ostojić, Sanja, Marinović-Cincović, Milena, Djonlagić, Jasna, "Influence of the content of hard segments on the properties of novel urethane-siloxane copolymers based on a poly(ε-caprolactone)-b-poly(dimethylsiloxane)-b-poly(ε-caprolactone) triblock copolymer" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 76, no. 12 (2011):1703-1723,
https://doi.org/10.2298/JSC110307146P . .