TY  - JOUR
AU  - Pergal, Marija V.
AU  - Antić, Vesna
AU  - Govedarica, Milutin N.
AU  - Godjevac, Dejan
AU  - Ostojić, Sanja
AU  - Djonlagić, Jasna
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2675
AB  - Novel polyurethane copolymers derived from 4,4'-methylenediphenyl diisocyanate (MDI), 1,4-butanediol (BD) and alpha, omega-dihydroxy-[poly(caprolactone)-poly (dimethylsiloxane)-poly(caprolactone)] (a, x-dihydroxy( PCL-PDMS-PCL); (M) over bar (n) 6100 g mol(-1)) were synthesized by a two-step polyaddition reaction in solution. In the synthesis of the polyurethanes, the PCL blocks served as a compatibilizer between the nonpolar PDMS blocks and the polar comonomers, MDI and BD. The synthesis of thermoplastic polyurethanes (TPU) with high soft segment contents was optimized in terms of the concentrations of the reactants, the molar ratio of the NCO/OH groups, and the time and temperature of the polyaddition reaction. The structure, composition, and hard MDI/BD segment length of the synthesized polyurethane copolymers were determined by H-1, C-13-NMR, and two-dimensional correlation (COSY, HSQC, and HMBC) spectroscopy, while the hydrogen bonding interactions in the copolymers were analyzed by FT-IR spectroscopy. The influence of the reaction conditions on the structure, molecular weight, thermal, and some physical properties was studied at constant composition of the reaction mixture. A change in the molar ratio of the NCO/OH groups and the reaction conditions modified not only the molecular weight of the synthesized polyurethanes, but also the microstructure and therefore the thermal and physical properties of the copolymers. It was demonstrated that only PCL segments with high soft segment contents crystallize, thereby showing spherulitic morphology.
PB  - Wiley-Blackwell, Hoboken
T2  - Journal of Applied Polymer Science
T1  - Synthesis and Characterization of Novel Urethane-Siloxane Copolymers with a High Content of PCL-PDMS-PCL Segments
EP  - 2730
IS  - 4
SP  - 2715
VL  - 122
DO  - 10.1002/app.33926
ER  - 

@article{
author = "Pergal, Marija V. and Antić, Vesna and Govedarica, Milutin N. and Godjevac, Dejan and Ostojić, Sanja and Djonlagić, Jasna",
year = "2011",
abstract = "Novel polyurethane copolymers derived from 4,4'-methylenediphenyl diisocyanate (MDI), 1,4-butanediol (BD) and alpha, omega-dihydroxy-[poly(caprolactone)-poly (dimethylsiloxane)-poly(caprolactone)] (a, x-dihydroxy( PCL-PDMS-PCL); (M) over bar (n) 6100 g mol(-1)) were synthesized by a two-step polyaddition reaction in solution. In the synthesis of the polyurethanes, the PCL blocks served as a compatibilizer between the nonpolar PDMS blocks and the polar comonomers, MDI and BD. The synthesis of thermoplastic polyurethanes (TPU) with high soft segment contents was optimized in terms of the concentrations of the reactants, the molar ratio of the NCO/OH groups, and the time and temperature of the polyaddition reaction. The structure, composition, and hard MDI/BD segment length of the synthesized polyurethane copolymers were determined by H-1, C-13-NMR, and two-dimensional correlation (COSY, HSQC, and HMBC) spectroscopy, while the hydrogen bonding interactions in the copolymers were analyzed by FT-IR spectroscopy. The influence of the reaction conditions on the structure, molecular weight, thermal, and some physical properties was studied at constant composition of the reaction mixture. A change in the molar ratio of the NCO/OH groups and the reaction conditions modified not only the molecular weight of the synthesized polyurethanes, but also the microstructure and therefore the thermal and physical properties of the copolymers. It was demonstrated that only PCL segments with high soft segment contents crystallize, thereby showing spherulitic morphology.",
publisher = "Wiley-Blackwell, Hoboken",
journal = "Journal of Applied Polymer Science",
title = "Synthesis and Characterization of Novel Urethane-Siloxane Copolymers with a High Content of PCL-PDMS-PCL Segments",
pages = "2730-2715",
number = "4",
volume = "122",
doi = "10.1002/app.33926"
}

Pergal, M. V., Antić, V., Govedarica, M. N., Godjevac, D., Ostojić, S.,& Djonlagić, J.. (2011). Synthesis and Characterization of Novel Urethane-Siloxane Copolymers with a High Content of PCL-PDMS-PCL Segments. in Journal of Applied Polymer Science
Wiley-Blackwell, Hoboken., 122(4), 2715-2730.
https://doi.org/10.1002/app.33926

Pergal MV, Antić V, Govedarica MN, Godjevac D, Ostojić S, Djonlagić J. Synthesis and Characterization of Novel Urethane-Siloxane Copolymers with a High Content of PCL-PDMS-PCL Segments. in Journal of Applied Polymer Science. 2011;122(4):2715-2730.
doi:10.1002/app.33926 .

Pergal, Marija V., Antić, Vesna, Govedarica, Milutin N., Godjevac, Dejan, Ostojić, Sanja, Djonlagić, Jasna, "Synthesis and Characterization of Novel Urethane-Siloxane Copolymers with a High Content of PCL-PDMS-PCL Segments" in Journal of Applied Polymer Science, 122, no. 4 (2011):2715-2730,
https://doi.org/10.1002/app.33926 . .

TY  - JOUR
AU  - Antić, Vesna
AU  - Antić, Mališa
AU  - Kronimus, Alexander
AU  - Oing, Katja
AU  - Schwarzbauer, Jan
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2721
AB  - Poly(vinylpyrrolidone) (PVP) is a widely used and environmentally stable synthetic polymer whose occurrence in wastewater is likely. However, an appropriate method for identification and quantification of this polymer in environmental samples is still lacking. Hence, in this study an analytical method based on continuous-flow off-line pyrolysis-gas chromatography/mass spectrometry (pyrolysis-GC/MS) was developed to identify and quantify PVP in waste and surface water samples. Pyrolysis of commercial PVP, of some personal care products, of spiked water samples as well as of wastewater samples and river water samples was performed in a tube furnace at 500 degrees C under a continuous nitrogen flow. GC/MS was used for identification of specific degradation products, while GC-FID analysis was performed for quantitative determination. The concentration of PVP was calculated on the basis of the main pyrolytic product, N-vinylpyrrolidone (NVP). Very good linear correlation between initial amounts of PVP and released amounts of NVP was obtained and used as external calibration. The detected level of PVP in investigated personal care products was 6.4 (hair gel), 0.8 (laundry detergent) and 1.4%(tablets for throat disinfection). Spiked water samples, wastewater samples and river water samples were pre-extracted with hexane and diethyl ether prior to pyrolysis. It was found that the recovery of spiked samples was 94.6 +/- 1.6% which indicated that pre-extraction did not provoke significant loss of polymer. Finally, application of the developed method on real environmental samples (river water) revealed that PVP was present in effluents from wastewater treatment plants in concentrations between 0.9 mg/L and 7 mg/L, as well as in river water affected by municipal sewage emissions with concentrations around 0.1 mg/L.
PB  - Elsevier, Amsterdam
T2  - Journal of Analytical and Applied Pyrolysis
T1  - Quantitative determination of poly(vinylpyrrolidone) by continuous-flow off-line pyrolysis-GC/MS
EP  - 99
IS  - 2
SP  - 93
VL  - 90
DO  - 10.1016/j.jaap.2010.10.011
ER  - 

@article{
author = "Antić, Vesna and Antić, Mališa and Kronimus, Alexander and Oing, Katja and Schwarzbauer, Jan",
year = "2011",
abstract = "Poly(vinylpyrrolidone) (PVP) is a widely used and environmentally stable synthetic polymer whose occurrence in wastewater is likely. However, an appropriate method for identification and quantification of this polymer in environmental samples is still lacking. Hence, in this study an analytical method based on continuous-flow off-line pyrolysis-gas chromatography/mass spectrometry (pyrolysis-GC/MS) was developed to identify and quantify PVP in waste and surface water samples. Pyrolysis of commercial PVP, of some personal care products, of spiked water samples as well as of wastewater samples and river water samples was performed in a tube furnace at 500 degrees C under a continuous nitrogen flow. GC/MS was used for identification of specific degradation products, while GC-FID analysis was performed for quantitative determination. The concentration of PVP was calculated on the basis of the main pyrolytic product, N-vinylpyrrolidone (NVP). Very good linear correlation between initial amounts of PVP and released amounts of NVP was obtained and used as external calibration. The detected level of PVP in investigated personal care products was 6.4 (hair gel), 0.8 (laundry detergent) and 1.4%(tablets for throat disinfection). Spiked water samples, wastewater samples and river water samples were pre-extracted with hexane and diethyl ether prior to pyrolysis. It was found that the recovery of spiked samples was 94.6 +/- 1.6% which indicated that pre-extraction did not provoke significant loss of polymer. Finally, application of the developed method on real environmental samples (river water) revealed that PVP was present in effluents from wastewater treatment plants in concentrations between 0.9 mg/L and 7 mg/L, as well as in river water affected by municipal sewage emissions with concentrations around 0.1 mg/L.",
publisher = "Elsevier, Amsterdam",
journal = "Journal of Analytical and Applied Pyrolysis",
title = "Quantitative determination of poly(vinylpyrrolidone) by continuous-flow off-line pyrolysis-GC/MS",
pages = "99-93",
number = "2",
volume = "90",
doi = "10.1016/j.jaap.2010.10.011"
}

Antić, V., Antić, M., Kronimus, A., Oing, K.,& Schwarzbauer, J.. (2011). Quantitative determination of poly(vinylpyrrolidone) by continuous-flow off-line pyrolysis-GC/MS. in Journal of Analytical and Applied Pyrolysis
Elsevier, Amsterdam., 90(2), 93-99.
https://doi.org/10.1016/j.jaap.2010.10.011

Antić V, Antić M, Kronimus A, Oing K, Schwarzbauer J. Quantitative determination of poly(vinylpyrrolidone) by continuous-flow off-line pyrolysis-GC/MS. in Journal of Analytical and Applied Pyrolysis. 2011;90(2):93-99.
doi:10.1016/j.jaap.2010.10.011 .

Antić, Vesna, Antić, Mališa, Kronimus, Alexander, Oing, Katja, Schwarzbauer, Jan, "Quantitative determination of poly(vinylpyrrolidone) by continuous-flow off-line pyrolysis-GC/MS" in Journal of Analytical and Applied Pyrolysis, 90, no. 2 (2011):93-99,
https://doi.org/10.1016/j.jaap.2010.10.011 . .

TY  - JOUR
AU  - Antić, Vesna
AU  - Pergal, Marija V.
AU  - Antić, Mališa
AU  - Djonlagić, Jasna
PY  - 2010
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2261
AB  - Two series of thermoplastic elastomers (TPES), based on poly(dimethylsiloxane) (PDMS) as the soft segment and poly(butylene terephthalate) (PBT) as the hard segment, were analyzed by dynamic mechanical spectroscopy. In the first TPES series the lengths of both hard and soft segments were varied while the mass ratio of the hard to soft segments was nearly constant (about 60 mass%). In the second series, the mass ratio of hard and soft segments was varied in the range from 60/40 to 40/60, with a constant length of soft PDMS segments. The influence of the structure and composition of TPESs on the rheological properties, such as complex dynamic viscosity, μ*, the storage, G', and loss, G', shear modulus as well as the microphase separation transition temperature, TMST, was examined. The obtained results showed that the storage modulus of the TPESs increased in a rubbery plateau region with increase in degree of crystallinity. The rheological measurements of TPESs also showed that a microphase reorganization occurred during the melting process. The microphase separation transition temperatures were in the range from 220 to 234°C. In the isotropic molten state, the complex dynamic viscosity increased with increasing both the content and length of hard PBT segments.
AB  - Dve serije termoplastičnih elastomera (TPES) na bazi poli(dimetilsiloksana) kao mekog segmenta i poli(butilentereftalata) kao tvrdog segmenta su analizirane dinamičko-mehaničkom spektroskopijom. U prvoj TPES seriji varirane su dužine tvrdih i mekih segmenata dok je njihov maseni odnos bio skoro konstantan (oko 60 mas%). U drugoj seriji, odnos tvrdih i mekih segmenata je variran u opsegu od 60/40 do 40/60, dok je dužina mekih PDMS segmenata bila konstantna. Ispitan je uticaj strukture i sastava TPES kopolimera na reološka svojstva, kao što su kompleksni dinamički viskozitet, μ*, moduli sačuvane, G', i izgubljene energije, G', i temperatura mikrofaznog razdvajanja, TMST. Dobijeni rezultati su pokazali da su uzorci sa većim stepenom kristaliničnosti imali i veće module sačuvane energije u gumolikom platou. Reološka merenja su takođe pokazala da svi TPES uzorci ispoljavaju mikrofaznu reorganizaciju u procesu topljenja. Temperature mikrofaznog razdvajanja su bile u opsegu od 220 do 234°C. U izotropskom rastopu, kompleksni dinamički viskoziteti su rasli sa povećanjem sadržaja i dužine PBT segmenata.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Rheological behaviour of thermoplastic poly(ester-siloxane)s
T1  - Reološko ponašanje termoplastičnih poli(estar-siloksana)
EP  - 545
IS  - 6
SP  - 537
VL  - 64
DO  - 10.2298/HEMIND101015067A
ER  - 

@article{
author = "Antić, Vesna and Pergal, Marija V. and Antić, Mališa and Djonlagić, Jasna",
year = "2010",
abstract = "Two series of thermoplastic elastomers (TPES), based on poly(dimethylsiloxane) (PDMS) as the soft segment and poly(butylene terephthalate) (PBT) as the hard segment, were analyzed by dynamic mechanical spectroscopy. In the first TPES series the lengths of both hard and soft segments were varied while the mass ratio of the hard to soft segments was nearly constant (about 60 mass%). In the second series, the mass ratio of hard and soft segments was varied in the range from 60/40 to 40/60, with a constant length of soft PDMS segments. The influence of the structure and composition of TPESs on the rheological properties, such as complex dynamic viscosity, μ*, the storage, G', and loss, G', shear modulus as well as the microphase separation transition temperature, TMST, was examined. The obtained results showed that the storage modulus of the TPESs increased in a rubbery plateau region with increase in degree of crystallinity. The rheological measurements of TPESs also showed that a microphase reorganization occurred during the melting process. The microphase separation transition temperatures were in the range from 220 to 234°C. In the isotropic molten state, the complex dynamic viscosity increased with increasing both the content and length of hard PBT segments., Dve serije termoplastičnih elastomera (TPES) na bazi poli(dimetilsiloksana) kao mekog segmenta i poli(butilentereftalata) kao tvrdog segmenta su analizirane dinamičko-mehaničkom spektroskopijom. U prvoj TPES seriji varirane su dužine tvrdih i mekih segmenata dok je njihov maseni odnos bio skoro konstantan (oko 60 mas%). U drugoj seriji, odnos tvrdih i mekih segmenata je variran u opsegu od 60/40 do 40/60, dok je dužina mekih PDMS segmenata bila konstantna. Ispitan je uticaj strukture i sastava TPES kopolimera na reološka svojstva, kao što su kompleksni dinamički viskozitet, μ*, moduli sačuvane, G', i izgubljene energije, G', i temperatura mikrofaznog razdvajanja, TMST. Dobijeni rezultati su pokazali da su uzorci sa većim stepenom kristaliničnosti imali i veće module sačuvane energije u gumolikom platou. Reološka merenja su takođe pokazala da svi TPES uzorci ispoljavaju mikrofaznu reorganizaciju u procesu topljenja. Temperature mikrofaznog razdvajanja su bile u opsegu od 220 do 234°C. U izotropskom rastopu, kompleksni dinamički viskoziteti su rasli sa povećanjem sadržaja i dužine PBT segmenata.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Rheological behaviour of thermoplastic poly(ester-siloxane)s, Reološko ponašanje termoplastičnih poli(estar-siloksana)",
pages = "545-537",
number = "6",
volume = "64",
doi = "10.2298/HEMIND101015067A"
}

Antić, V., Pergal, M. V., Antić, M.,& Djonlagić, J.. (2010). Rheological behaviour of thermoplastic poly(ester-siloxane)s. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 64(6), 537-545.
https://doi.org/10.2298/HEMIND101015067A

Antić V, Pergal MV, Antić M, Djonlagić J. Rheological behaviour of thermoplastic poly(ester-siloxane)s. in Hemijska industrija. 2010;64(6):537-545.
doi:10.2298/HEMIND101015067A .

Antić, Vesna, Pergal, Marija V., Antić, Mališa, Djonlagić, Jasna, "Rheological behaviour of thermoplastic poly(ester-siloxane)s" in Hemijska industrija, 64, no. 6 (2010):537-545,
https://doi.org/10.2298/HEMIND101015067A . .

TY  - JOUR
AU  - Antić, Vesna
AU  - Vucković, Marija V.
AU  - Dojčinović, Biljana
AU  - Antić, Mališa
AU  - Barać, Miroljub
AU  - Govedarica, Milutin N.
PY  - 2008
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1801
AB  - The modality of the incorporation of silanol-terminated siloxanes into copolymers with butylene terephthalate were investigated and determined. Besides siloxanes, the other participants in this well-known copolymerization, called the catalyzed two-step transesterification/polycondensation reaction, are dimethyl terephthalate and 1,4-butanediol. The employed approach to this problem was to exactly examine all the possibilities of the reactions between particular pairs of reactants, as well as of single reactants. The final results were, firstly, that reactions between siloxanes and dimethyl terephthalate did not occur and, secondly, that the only possibility for silanol-terminated siloxanes to be incorporated into the copolymers was by means of their condensation with 1,4-butanediol. This means that siloxanes are incorporated into the copolymer by ether and not by ester linkages.
PB  - Elsevier, Amsterdam
T2  - Reactive & Functional Polymers
T1  - About the mode of incorporation of silanol-terminated polysiloxanes into butylene terephthalate-b-dimethylsiloxane copolymers
EP  - 860
IS  - 4
SP  - 851
VL  - 68
DO  - 10.1016/j.reactfunctpolym.2007.12.004
ER  - 

@article{
author = "Antić, Vesna and Vucković, Marija V. and Dojčinović, Biljana and Antić, Mališa and Barać, Miroljub and Govedarica, Milutin N.",
year = "2008",
abstract = "The modality of the incorporation of silanol-terminated siloxanes into copolymers with butylene terephthalate were investigated and determined. Besides siloxanes, the other participants in this well-known copolymerization, called the catalyzed two-step transesterification/polycondensation reaction, are dimethyl terephthalate and 1,4-butanediol. The employed approach to this problem was to exactly examine all the possibilities of the reactions between particular pairs of reactants, as well as of single reactants. The final results were, firstly, that reactions between siloxanes and dimethyl terephthalate did not occur and, secondly, that the only possibility for silanol-terminated siloxanes to be incorporated into the copolymers was by means of their condensation with 1,4-butanediol. This means that siloxanes are incorporated into the copolymer by ether and not by ester linkages.",
publisher = "Elsevier, Amsterdam",
journal = "Reactive & Functional Polymers",
title = "About the mode of incorporation of silanol-terminated polysiloxanes into butylene terephthalate-b-dimethylsiloxane copolymers",
pages = "860-851",
number = "4",
volume = "68",
doi = "10.1016/j.reactfunctpolym.2007.12.004"
}

Antić, V., Vucković, M. V., Dojčinović, B., Antić, M., Barać, M.,& Govedarica, M. N.. (2008). About the mode of incorporation of silanol-terminated polysiloxanes into butylene terephthalate-b-dimethylsiloxane copolymers. in Reactive & Functional Polymers
Elsevier, Amsterdam., 68(4), 851-860.
https://doi.org/10.1016/j.reactfunctpolym.2007.12.004

Antić V, Vucković MV, Dojčinović B, Antić M, Barać M, Govedarica MN. About the mode of incorporation of silanol-terminated polysiloxanes into butylene terephthalate-b-dimethylsiloxane copolymers. in Reactive & Functional Polymers. 2008;68(4):851-860.
doi:10.1016/j.reactfunctpolym.2007.12.004 .

Antić, Vesna, Vucković, Marija V., Dojčinović, Biljana, Antić, Mališa, Barać, Miroljub, Govedarica, Milutin N., "About the mode of incorporation of silanol-terminated polysiloxanes into butylene terephthalate-b-dimethylsiloxane copolymers" in Reactive & Functional Polymers, 68, no. 4 (2008):851-860,
https://doi.org/10.1016/j.reactfunctpolym.2007.12.004 . .