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  - https://cer.ihtm.bg.ac.rs/handle/123456789/2260
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
VL  - 56
IS  - 17
SP  - 4970
EP  - 4983
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",
volume = "56",
number = "17",
pages = "4970-4983",
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  - Pergal, Marija
AU  - Stefanović, Ivan
AU  - Poreba, Rafal
AU  - Steinhart, Milos
AU  - Jovancic, Petar
AU  - Ostojić, Sanja
AU  - Spirkova, Milena
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3003
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
VL  - 56
IS  - 17
SP  - 4970
EP  - 4983
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",
volume = "56",
number = "17",
pages = "4970-4983",
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  - https://cer.ihtm.bg.ac.rs/handle/123456789/1989
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
VL  - 70
IS  - 6
SP  - 725
EP  - 738
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",
volume = "70",
number = "6",
pages = "725-738",
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 . .