TY  - JOUR
AU  - Marković, Bojana M.
AU  - Stefanović, Ivan S.
AU  - Nastasović, Aleksandra B.
AU  - Sandić, Zvjezdana P.
AU  - Suručić, Ljiljana T.
AU  - Dapčević, Aleksandra
AU  - Džunuzović, Jasna V.
AU  - Jagličić, Zvonko
AU  - Vuković, Zorica M.
AU  - Pavlović, Vladimir
AU  - Onjia, Antonije E.
PY  - 2022
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6019
AB  - A novel magnetic polymer/bentonite composite was prepared by suspension copolymerization of glycidyl methacrylate and ethylene glycol dimethacrylate in the presence of magnetic bentonite (MB-PGME) and functionalized with ethylene diamine and hexamethylene diamine (MB-PGME-ED and MB-PGME-HD). The obtained samples were characterized in terms of structure as well as thermal, magnetic and morphological properties. The sorption of rhenium (Re) and tungsten (W) from aqueous solution onto MB-PGME-ED and MB-PGME-HD was investigated considering their contact time and different initial ion concentration, giving possibility for usage of these composites as commercial sorbents. The sorption system follows the pseudo-second order and intraparticle diffusion kinetic models. The results indicated a better fit with the Freundlich isotherm model.
PB  - International Institute for the Science of Sintering (IISS)
T2  - Science of Sintering
T1  - Novel Magnetic Polymer/bentonite Composite: Characterization and Application for Re(VII) and W(VI) Adsorption
EP  - 428
IS  - 4
SP  - 419
VL  - 53
DO  - 10.2298/SOS2104419M
ER  - 

@article{
author = "Marković, Bojana M. and Stefanović, Ivan S. and Nastasović, Aleksandra B. and Sandić, Zvjezdana P. and Suručić, Ljiljana T. and Dapčević, Aleksandra and Džunuzović, Jasna V. and Jagličić, Zvonko and Vuković, Zorica M. and Pavlović, Vladimir and Onjia, Antonije E.",
year = "2022",
abstract = "A novel magnetic polymer/bentonite composite was prepared by suspension copolymerization of glycidyl methacrylate and ethylene glycol dimethacrylate in the presence of magnetic bentonite (MB-PGME) and functionalized with ethylene diamine and hexamethylene diamine (MB-PGME-ED and MB-PGME-HD). The obtained samples were characterized in terms of structure as well as thermal, magnetic and morphological properties. The sorption of rhenium (Re) and tungsten (W) from aqueous solution onto MB-PGME-ED and MB-PGME-HD was investigated considering their contact time and different initial ion concentration, giving possibility for usage of these composites as commercial sorbents. The sorption system follows the pseudo-second order and intraparticle diffusion kinetic models. The results indicated a better fit with the Freundlich isotherm model.",
publisher = "International Institute for the Science of Sintering (IISS)",
journal = "Science of Sintering",
title = "Novel Magnetic Polymer/bentonite Composite: Characterization and Application for Re(VII) and W(VI) Adsorption",
pages = "428-419",
number = "4",
volume = "53",
doi = "10.2298/SOS2104419M"
}

Marković, B. M., Stefanović, I. S., Nastasović, A. B., Sandić, Z. P., Suručić, L. T., Dapčević, A., Džunuzović, J. V., Jagličić, Z., Vuković, Z. M., Pavlović, V.,& Onjia, A. E.. (2022). Novel Magnetic Polymer/bentonite Composite: Characterization and Application for Re(VII) and W(VI) Adsorption. in Science of Sintering
International Institute for the Science of Sintering (IISS)., 53(4), 419-428.
https://doi.org/10.2298/SOS2104419M

Marković BM, Stefanović IS, Nastasović AB, Sandić ZP, Suručić LT, Dapčević A, Džunuzović JV, Jagličić Z, Vuković ZM, Pavlović V, Onjia AE. Novel Magnetic Polymer/bentonite Composite: Characterization and Application for Re(VII) and W(VI) Adsorption. in Science of Sintering. 2022;53(4):419-428.
doi:10.2298/SOS2104419M .

Marković, Bojana M., Stefanović, Ivan S., Nastasović, Aleksandra B., Sandić, Zvjezdana P., Suručić, Ljiljana T., Dapčević, Aleksandra, Džunuzović, Jasna V., Jagličić, Zvonko, Vuković, Zorica M., Pavlović, Vladimir, Onjia, Antonije E., "Novel Magnetic Polymer/bentonite Composite: Characterization and Application for Re(VII) and W(VI) Adsorption" in Science of Sintering, 53, no. 4 (2022):419-428,
https://doi.org/10.2298/SOS2104419M . .

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 . .