TY  - JOUR
AU  - Stefanović, Ivan S.
AU  - Džunuzović, Jasna V.
AU  - Džunuzović, Enis S.
AU  - Ranđelović, Danijela V.
PY  - 2024-02
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6993
AB  - The aim of this work was to examine the influence of polycaprolactone (PCL) as a soft segment (SS) on the surface properties of polyurethane networks (PUNs). Five PUNs with different SS content (from 10 to 50 wt%) were prepared using Boltorn® aliphatic hyperbranched polyester of the second pseudo generation and isophorone diisocyanate as components of hard segments. The structure, hydrophobicity, wettability, and swelling behavior of these PUNs were investigated. Primarily, the obtained results showed that properties of prepared PUNs strongly depend on the content of SS that is, PCL. It has been established that the increase of SS content reduced the degree of hydrogen bonding in PUNs. Also, the increase of the SS content in PUNs induced appearance of more pronounced microphase separated morphology, better hydrophobicity and non-wetting with diiodomethane. Simultaneously, the increase of the SS content led to the decrease of contact angles with formamide, and surface free energy of the prepared PUNs. These PUNs show good surface properties that are required for their potential application such as coatings.
PB  - John Wiley and Sons Inc.
T2  - Journal of Applied Polymer Science
T1  - The influence of polycaprolactone content on the surface properties of polyurethane networks
IS  - 8
SP  - e54989
VL  - 141
DO  - 10.1002/app.54989
ER  - 

@article{
author = "Stefanović, Ivan S. and Džunuzović, Jasna V. and Džunuzović, Enis S. and Ranđelović, Danijela V.",
year = "2024-02",
abstract = "The aim of this work was to examine the influence of polycaprolactone (PCL) as a soft segment (SS) on the surface properties of polyurethane networks (PUNs). Five PUNs with different SS content (from 10 to 50 wt%) were prepared using Boltorn® aliphatic hyperbranched polyester of the second pseudo generation and isophorone diisocyanate as components of hard segments. The structure, hydrophobicity, wettability, and swelling behavior of these PUNs were investigated. Primarily, the obtained results showed that properties of prepared PUNs strongly depend on the content of SS that is, PCL. It has been established that the increase of SS content reduced the degree of hydrogen bonding in PUNs. Also, the increase of the SS content in PUNs induced appearance of more pronounced microphase separated morphology, better hydrophobicity and non-wetting with diiodomethane. Simultaneously, the increase of the SS content led to the decrease of contact angles with formamide, and surface free energy of the prepared PUNs. These PUNs show good surface properties that are required for their potential application such as coatings.",
publisher = "John Wiley and Sons Inc.",
journal = "Journal of Applied Polymer Science",
title = "The influence of polycaprolactone content on the surface properties of polyurethane networks",
number = "8",
pages = "e54989",
volume = "141",
doi = "10.1002/app.54989"
}

Stefanović, I. S., Džunuzović, J. V., Džunuzović, E. S.,& Ranđelović, D. V.. (2024-02). The influence of polycaprolactone content on the surface properties of polyurethane networks. in Journal of Applied Polymer Science
John Wiley and Sons Inc.., 141(8), e54989.
https://doi.org/10.1002/app.54989

Stefanović IS, Džunuzović JV, Džunuzović ES, Ranđelović DV. The influence of polycaprolactone content on the surface properties of polyurethane networks. in Journal of Applied Polymer Science. 2024;141(8):e54989.
doi:10.1002/app.54989 .

Stefanović, Ivan S., Džunuzović, Jasna V., Džunuzović, Enis S., Ranđelović, Danijela V., "The influence of polycaprolactone content on the surface properties of polyurethane networks" in Journal of Applied Polymer Science, 141, no. 8 (2024-02):e54989,
https://doi.org/10.1002/app.54989 . .

TY  - JOUR
AU  - Stefanović, Ivan S.
AU  - Marković, Bojana M.
AU  - Nastasović, Aleksandra B.
AU  - Vuković, Zorica M.
AU  - Dapčević, Aleksandra
AU  - Pavlović, Vladimir B.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5174
AB  - The impact of the type and amounts of nanofiller on the features of the glycidyl methacrylate-co-ethylene glycol dimethacrylate (GMA-co-EGDMA)/organomodified montmorillonite (OMt) nanocomposites that were prepared by in situ radical suspension polymerization, was examined. Cloisite 30B and Cloisite 25A were used in this study as nanofillers, in amounts of 2 and 10 wt.%. The structure, morphology, thermal stability and porosity of the initial GMA-co-EGDMA copolymer and their nanocomposites were examined by ATR-FTIR analysis, wide angle X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), thermogravimetric analysis (TG) and mercury porosimetry. It has been established that both clay nanofillers were successfully incorporated into the structure of the initial copolymer, simultaneously on their surface and also on cross-sectional area. Prepared samples with 2 wt.% have predominantly exfoliated, while samples with 10 wt.% have some tactoids-aggregates structure of the OMt layers. Thermogravimetric analysis revealed that after ~ 30 % of degradation, all nanocomposites become more thermal stable than the initial copolymer. The obtained results indicate that porosity parameters can be easily modified with the addition of clay nanofillers and thus prepared nanocomposites adjusted to specific purposes. © 2022 Authors. Published by association for ETRAN Society.
T2  - Science of Sintering
T2  - Science of Sintering
T1  - Preparation and Characterization of Novel Glycidyl Methacrylate/Clay Nanocomposites
EP  - 200
IS  - 2
SP  - 189
VL  - 54
DO  - 10.2298/SOS2202189S
ER  - 

@article{
author = "Stefanović, Ivan S. and Marković, Bojana M. and Nastasović, Aleksandra B. and Vuković, Zorica M. and Dapčević, Aleksandra and Pavlović, Vladimir B.",
year = "2022",
abstract = "The impact of the type and amounts of nanofiller on the features of the glycidyl methacrylate-co-ethylene glycol dimethacrylate (GMA-co-EGDMA)/organomodified montmorillonite (OMt) nanocomposites that were prepared by in situ radical suspension polymerization, was examined. Cloisite 30B and Cloisite 25A were used in this study as nanofillers, in amounts of 2 and 10 wt.%. The structure, morphology, thermal stability and porosity of the initial GMA-co-EGDMA copolymer and their nanocomposites were examined by ATR-FTIR analysis, wide angle X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), thermogravimetric analysis (TG) and mercury porosimetry. It has been established that both clay nanofillers were successfully incorporated into the structure of the initial copolymer, simultaneously on their surface and also on cross-sectional area. Prepared samples with 2 wt.% have predominantly exfoliated, while samples with 10 wt.% have some tactoids-aggregates structure of the OMt layers. Thermogravimetric analysis revealed that after ~ 30 % of degradation, all nanocomposites become more thermal stable than the initial copolymer. The obtained results indicate that porosity parameters can be easily modified with the addition of clay nanofillers and thus prepared nanocomposites adjusted to specific purposes. © 2022 Authors. Published by association for ETRAN Society.",
journal = "Science of Sintering, Science of Sintering",
title = "Preparation and Characterization of Novel Glycidyl Methacrylate/Clay Nanocomposites",
pages = "200-189",
number = "2",
volume = "54",
doi = "10.2298/SOS2202189S"
}

Stefanović, I. S., Marković, B. M., Nastasović, A. B., Vuković, Z. M., Dapčević, A.,& Pavlović, V. B.. (2022). Preparation and Characterization of Novel Glycidyl Methacrylate/Clay Nanocomposites. in Science of Sintering, 54(2), 189-200.
https://doi.org/10.2298/SOS2202189S

Stefanović IS, Marković BM, Nastasović AB, Vuković ZM, Dapčević A, Pavlović VB. Preparation and Characterization of Novel Glycidyl Methacrylate/Clay Nanocomposites. in Science of Sintering. 2022;54(2):189-200.
doi:10.2298/SOS2202189S .

Stefanović, Ivan S., Marković, Bojana M., Nastasović, Aleksandra B., Vuković, Zorica M., Dapčević, Aleksandra, Pavlović, Vladimir B., "Preparation and Characterization of Novel Glycidyl Methacrylate/Clay Nanocomposites" in Science of Sintering, 54, no. 2 (2022):189-200,
https://doi.org/10.2298/SOS2202189S . .

TY  - JOUR
AU  - Pergal, Marija
AU  - Stefanović, Ivan
AU  - Poreba, Rafal
AU  - Steinhart, Milos
AU  - Jovancic, Petar
AU  - Ostojić, Sanja
AU  - Spirkova, Milena
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5825
AB  - Novel poly(dimethylsiloxane)-based polyurethane nanocomposites (TPU-NCs) were synthesized using in situ polymerization with the nanoclay Cloisite 30B. Differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis showed that TPU-NCs with an organoclay content of  LT = 5 wt % exhibited increased thermal stability, storage modulus, and hard-segment melt temperatures but decreased degrees of crystallinity. TPU-NCs displayed increased surface hydrophilicity and enhanced surface free energy with increasing organoclay content. Small and wide-angle X-ray scattering confirmed intercalated formations of organoclays in the nanocomposites. Individual clay particles on the surfaces of TPUs with lower organoclay loadings (1 or 3 wt %) or organoclay agglomerates in TPUs with higher amounts of organoclay (>= 5 wt %) were detectable using scanning electron microscopy. The relatively smooth and homogeneous character of pure TPU and the distinctly heterogeneous and rough surfaces of TPU-NCs were detected via atomic force microscopy. Among the nanomaterials prepared, TPU-NCs with 1 wt % organoclay provided the best balance between the organoclay concentration and the functional properties desired in biomedical applications.
PB  - American Chemical Society (ACS)
T2  - Industrial and Engineering Chemistry Research
T1  - Influence of the Organoclay Content on the Structure, Morphology, and Surface Related Properties of Novel Poly(dimethylsiloxane)-Based Polyurethane/Organoclay Nanocomposites
EP  - 4983
IS  - 17
SP  - 4970
VL  - 56
DO  - 10.1021/acs.iecr.6b04913
ER  - 

@article{
author = "Pergal, Marija and Stefanović, Ivan and Poreba, Rafal and Steinhart, Milos and Jovancic, Petar and Ostojić, Sanja and Spirkova, Milena",
year = "2017",
abstract = "Novel poly(dimethylsiloxane)-based polyurethane nanocomposites (TPU-NCs) were synthesized using in situ polymerization with the nanoclay Cloisite 30B. Differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis showed that TPU-NCs with an organoclay content of  LT = 5 wt % exhibited increased thermal stability, storage modulus, and hard-segment melt temperatures but decreased degrees of crystallinity. TPU-NCs displayed increased surface hydrophilicity and enhanced surface free energy with increasing organoclay content. Small and wide-angle X-ray scattering confirmed intercalated formations of organoclays in the nanocomposites. Individual clay particles on the surfaces of TPUs with lower organoclay loadings (1 or 3 wt %) or organoclay agglomerates in TPUs with higher amounts of organoclay (>= 5 wt %) were detectable using scanning electron microscopy. The relatively smooth and homogeneous character of pure TPU and the distinctly heterogeneous and rough surfaces of TPU-NCs were detected via atomic force microscopy. Among the nanomaterials prepared, TPU-NCs with 1 wt % organoclay provided the best balance between the organoclay concentration and the functional properties desired in biomedical applications.",
publisher = "American Chemical Society (ACS)",
journal = "Industrial and Engineering Chemistry Research",
title = "Influence of the Organoclay Content on the Structure, Morphology, and Surface Related Properties of Novel Poly(dimethylsiloxane)-Based Polyurethane/Organoclay Nanocomposites",
pages = "4983-4970",
number = "17",
volume = "56",
doi = "10.1021/acs.iecr.6b04913"
}

Pergal, M., Stefanović, I., Poreba, R., Steinhart, M., Jovancic, P., Ostojić, S.,& Spirkova, M.. (2017). Influence of the Organoclay Content on the Structure, Morphology, and Surface Related Properties of Novel Poly(dimethylsiloxane)-Based Polyurethane/Organoclay Nanocomposites. in Industrial and Engineering Chemistry Research
American Chemical Society (ACS)., 56(17), 4970-4983.
https://doi.org/10.1021/acs.iecr.6b04913

Pergal M, Stefanović I, Poreba R, Steinhart M, Jovancic P, Ostojić S, Spirkova M. Influence of the Organoclay Content on the Structure, Morphology, and Surface Related Properties of Novel Poly(dimethylsiloxane)-Based Polyurethane/Organoclay Nanocomposites. in Industrial and Engineering Chemistry Research. 2017;56(17):4970-4983.
doi:10.1021/acs.iecr.6b04913 .

Pergal, Marija, Stefanović, Ivan, Poreba, Rafal, Steinhart, Milos, Jovancic, Petar, Ostojić, Sanja, Spirkova, Milena, "Influence of the Organoclay Content on the Structure, Morphology, and Surface Related Properties of Novel Poly(dimethylsiloxane)-Based Polyurethane/Organoclay Nanocomposites" in Industrial and Engineering Chemistry Research, 56, no. 17 (2017):4970-4983,
https://doi.org/10.1021/acs.iecr.6b04913 . .

TY  - JOUR
AU  - Stefanović, Ivan
AU  - Gođevac, Dejan
AU  - Spirkova, Milena
AU  - Jovancic, Petar
AU  - Tešević, Vele
AU  - Milačić, Vesna
AU  - Pergal, Marija
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5830
AB  - Segmented thermoplastic polyurethane copolymers (PURs) were synthesized using 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol as the hard segment and alpha,omega-dihydroxy-poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) (PPO-PDMS) as the soft segment. The content of incorporated soft segments in PURs varied in the range from 40 to 90 wt.%. The structure, molecular weights and crystallinity of obtained copolymers were monitored by FTIR, H-1- and 2D-NMR spectroscopy, and GPC and DSC analysis, respectively. Surface free energy analysis indicates the presence of hydrophobic (siloxane) groups on the surface, giving highly hydrophobic nature to the obtained PURs films. Water absorption measurements showed that the increase of the hydrophobic PPO-PDMS segment content led to the decrease of percentage of absorbed water in copolymers. SEM and AFM analysis revealed that copolymers with lower content of PPO-PDMS segments have higher microphase separation between segments. The results obtained in this work indicate that synthesized PURs based on PPO-PDMS demonstrated proper surface and morphological properties with a great potential for variety of applications such as hydrophobic coatings in biomedicine.
PB  - Assoc Chemical Engineers Serbia, Belgrade
T2  - Hemijska industrija
T1  - Impact of the poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly-(propylene oxide) macrodiols on the surface-related properties of polyurethane copolymers
EP  - 738
IS  - 6
SP  - 725
VL  - 70
DO  - 10.2298/HEMIND151127009S
ER  - 

@article{
author = "Stefanović, Ivan and Gođevac, Dejan and Spirkova, Milena and Jovancic, Petar and Tešević, Vele and Milačić, Vesna and Pergal, Marija",
year = "2016",
abstract = "Segmented thermoplastic polyurethane copolymers (PURs) were synthesized using 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol as the hard segment and alpha,omega-dihydroxy-poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) (PPO-PDMS) as the soft segment. The content of incorporated soft segments in PURs varied in the range from 40 to 90 wt.%. The structure, molecular weights and crystallinity of obtained copolymers were monitored by FTIR, H-1- and 2D-NMR spectroscopy, and GPC and DSC analysis, respectively. Surface free energy analysis indicates the presence of hydrophobic (siloxane) groups on the surface, giving highly hydrophobic nature to the obtained PURs films. Water absorption measurements showed that the increase of the hydrophobic PPO-PDMS segment content led to the decrease of percentage of absorbed water in copolymers. SEM and AFM analysis revealed that copolymers with lower content of PPO-PDMS segments have higher microphase separation between segments. The results obtained in this work indicate that synthesized PURs based on PPO-PDMS demonstrated proper surface and morphological properties with a great potential for variety of applications such as hydrophobic coatings in biomedicine.",
publisher = "Assoc Chemical Engineers Serbia, Belgrade",
journal = "Hemijska industrija",
title = "Impact of the poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly-(propylene oxide) macrodiols on the surface-related properties of polyurethane copolymers",
pages = "738-725",
number = "6",
volume = "70",
doi = "10.2298/HEMIND151127009S"
}

Stefanović, I., Gođevac, D., Spirkova, M., Jovancic, P., Tešević, V., Milačić, V.,& Pergal, M.. (2016). Impact of the poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly-(propylene oxide) macrodiols on the surface-related properties of polyurethane copolymers. in Hemijska industrija
Assoc Chemical Engineers Serbia, Belgrade., 70(6), 725-738.
https://doi.org/10.2298/HEMIND151127009S

Stefanović I, Gođevac D, Spirkova M, Jovancic P, Tešević V, Milačić V, Pergal M. Impact of the poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly-(propylene oxide) macrodiols on the surface-related properties of polyurethane copolymers. in Hemijska industrija. 2016;70(6):725-738.
doi:10.2298/HEMIND151127009S .

Stefanović, Ivan, Gođevac, Dejan, Spirkova, Milena, Jovancic, Petar, Tešević, Vele, Milačić, Vesna, Pergal, Marija, "Impact of the poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly-(propylene oxide) macrodiols on the surface-related properties of polyurethane copolymers" in Hemijska industrija, 70, no. 6 (2016):725-738,
https://doi.org/10.2298/HEMIND151127009S . .

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://TechnoRep.tmf.bg.ac.rs/handle/123456789/5794
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 . .