TY  - JOUR
AU  - Bogdanović, Gordana
AU  - Kovač, Tijana
AU  - Džunuzović, Enis
AU  - Spirkova, Milena
AU  - Ahrenkiel, Scott Phillip
AU  - Nedeljković, Jovan
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3731
AB  - The mechanical properties of nanocomposites obtained by incorporation of fairly uniform hematite nanorods (alpha-Fe2O3 NRs) into epoxy resin were studied as a function of the content of the inorganic phase. A thorough microstructural characterization of the alpha-Fe2O3 NRs and the nanocomposites was performed using transmission electron microscopy (TEM) and atomic force microscopy (AFM). The TEM measurements revealed rod-like morphology of the nanofiller with a uniform size distribution (8.5 nmx170 nm, diameterxlength). High-magnification TEM and AFM measurements indicated agglomeration of alpha-Fe2O3 NRs embedded in the epoxy resin. Stress at break, strain at break, elastic modulus and tensile toughness of the nanocomposites were compared with the data obtained for pure epoxy resin. Significant influence of nanofiller on the mechanical properties of epoxy resin, as well as on the glass transition temperature, could be noticed for samples with low contents of the inorganic phase (up to 1 wt. %).
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Influence of hematite nanorods on the mechanical properties of epoxy resin
EP  - 447
IS  - 4
SP  - 437
VL  - 82
DO  - 10.2298/JSC160707017B
ER  - 

@article{
author = "Bogdanović, Gordana and Kovač, Tijana and Džunuzović, Enis and Spirkova, Milena and Ahrenkiel, Scott Phillip and Nedeljković, Jovan",
year = "2017",
abstract = "The mechanical properties of nanocomposites obtained by incorporation of fairly uniform hematite nanorods (alpha-Fe2O3 NRs) into epoxy resin were studied as a function of the content of the inorganic phase. A thorough microstructural characterization of the alpha-Fe2O3 NRs and the nanocomposites was performed using transmission electron microscopy (TEM) and atomic force microscopy (AFM). The TEM measurements revealed rod-like morphology of the nanofiller with a uniform size distribution (8.5 nmx170 nm, diameterxlength). High-magnification TEM and AFM measurements indicated agglomeration of alpha-Fe2O3 NRs embedded in the epoxy resin. Stress at break, strain at break, elastic modulus and tensile toughness of the nanocomposites were compared with the data obtained for pure epoxy resin. Significant influence of nanofiller on the mechanical properties of epoxy resin, as well as on the glass transition temperature, could be noticed for samples with low contents of the inorganic phase (up to 1 wt. %).",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Influence of hematite nanorods on the mechanical properties of epoxy resin",
pages = "447-437",
number = "4",
volume = "82",
doi = "10.2298/JSC160707017B"
}

Bogdanović, G., Kovač, T., Džunuzović, E., Spirkova, M., Ahrenkiel, S. P.,& Nedeljković, J.. (2017). Influence of hematite nanorods on the mechanical properties of epoxy resin. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 82(4), 437-447.
https://doi.org/10.2298/JSC160707017B

Bogdanović G, Kovač T, Džunuzović E, Spirkova M, Ahrenkiel SP, Nedeljković J. Influence of hematite nanorods on the mechanical properties of epoxy resin. in Journal of the Serbian Chemical Society. 2017;82(4):437-447.
doi:10.2298/JSC160707017B .

Bogdanović, Gordana, Kovač, Tijana, Džunuzović, Enis, Spirkova, Milena, Ahrenkiel, Scott Phillip, Nedeljković, Jovan, "Influence of hematite nanorods on the mechanical properties of epoxy resin" in Journal of the Serbian Chemical Society, 82, no. 4 (2017):437-447,
https://doi.org/10.2298/JSC160707017B . .

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  - Džunuzović, Jasna
AU  - Pergal, Marija
AU  - Poreba, Rafal
AU  - Ostojić, Sanja
AU  - Lazić, Nada
AU  - Spirkova, Milena
AU  - Jovanovic, Slobodan
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5740
AB  - Polyurethane networks based on Boltorn hyperbranched polyesters (HBPs) of different pseudogenerations as cross-linkers, alpha,omega-dihydroxy(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4'-methylenediphenyl diisocyanate were synthesized using a two-step polymerization reaction in solution. The influence of the pseudogeneration number of Boltorn HBPs on the thermomechanical and thermal properties and morphologies of polyurethane networks was investigated using FTIR, DMTA, TGA, hardness measurements, SEM, and SAXS. Synthesized polyurethanes showed higher cross-linking density and hardness and lower thermal stability with increasing pseudogeneration number of HBP. Samples with lower EO-PDMS-EO content exhibited slightly better thermal stability and higher hardness. All utilized characterization methods yielded consistent results and confirmed the existence of microphase separated morphology with the appearance of certain microphase mixing between segments as the pseudogeneration number of HBP increased. The obtained results revealed that the synthesized polyurethanes have good thermal and thermomechanical properties, which can be tailored by changing the pseudogeneration number of the HBP or the EO-PDMS-EO content.
PB  - American Chemical Society (ACS)
T2  - Industrial and Engineering Chemistry Research
T1  - Studies of the Thermal and Mechanical Properties of Poly(urethane-siloxane)s Cross-Linked by Hyperbranched Polyesters
EP  - 10832
IS  - 33
SP  - 10824
VL  - 51
DO  - 10.1021/ie300927z
ER  - 

@article{
author = "Džunuzović, Jasna and Pergal, Marija and Poreba, Rafal and Ostojić, Sanja and Lazić, Nada and Spirkova, Milena and Jovanovic, Slobodan",
year = "2012",
abstract = "Polyurethane networks based on Boltorn hyperbranched polyesters (HBPs) of different pseudogenerations as cross-linkers, alpha,omega-dihydroxy(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4'-methylenediphenyl diisocyanate were synthesized using a two-step polymerization reaction in solution. The influence of the pseudogeneration number of Boltorn HBPs on the thermomechanical and thermal properties and morphologies of polyurethane networks was investigated using FTIR, DMTA, TGA, hardness measurements, SEM, and SAXS. Synthesized polyurethanes showed higher cross-linking density and hardness and lower thermal stability with increasing pseudogeneration number of HBP. Samples with lower EO-PDMS-EO content exhibited slightly better thermal stability and higher hardness. All utilized characterization methods yielded consistent results and confirmed the existence of microphase separated morphology with the appearance of certain microphase mixing between segments as the pseudogeneration number of HBP increased. The obtained results revealed that the synthesized polyurethanes have good thermal and thermomechanical properties, which can be tailored by changing the pseudogeneration number of the HBP or the EO-PDMS-EO content.",
publisher = "American Chemical Society (ACS)",
journal = "Industrial and Engineering Chemistry Research",
title = "Studies of the Thermal and Mechanical Properties of Poly(urethane-siloxane)s Cross-Linked by Hyperbranched Polyesters",
pages = "10832-10824",
number = "33",
volume = "51",
doi = "10.1021/ie300927z"
}

Džunuzović, J., Pergal, M., Poreba, R., Ostojić, S., Lazić, N., Spirkova, M.,& Jovanovic, S.. (2012). Studies of the Thermal and Mechanical Properties of Poly(urethane-siloxane)s Cross-Linked by Hyperbranched Polyesters. in Industrial and Engineering Chemistry Research
American Chemical Society (ACS)., 51(33), 10824-10832.
https://doi.org/10.1021/ie300927z

Džunuzović J, Pergal M, Poreba R, Ostojić S, Lazić N, Spirkova M, Jovanovic S. Studies of the Thermal and Mechanical Properties of Poly(urethane-siloxane)s Cross-Linked by Hyperbranched Polyesters. in Industrial and Engineering Chemistry Research. 2012;51(33):10824-10832.
doi:10.1021/ie300927z .

Džunuzović, Jasna, Pergal, Marija, Poreba, Rafal, Ostojić, Sanja, Lazić, Nada, Spirkova, Milena, Jovanovic, Slobodan, "Studies of the Thermal and Mechanical Properties of Poly(urethane-siloxane)s Cross-Linked by Hyperbranched Polyesters" in Industrial and Engineering Chemistry Research, 51, no. 33 (2012):10824-10832,
https://doi.org/10.1021/ie300927z . .

TY  - JOUR
AU  - Džunuzović, Jasna
AU  - Pergal, Marija
AU  - Poreba, Rafal
AU  - Vodnik, Vesna
AU  - Simonović, Branislav
AU  - Spirkova, Milena
AU  - Jovanovic, Slobodan
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5666
AB  - Six polyurethane networks were synthesized from Boltorn (R) hyperbranched polyester of the second pseudo generation, alpha,omega-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4'-methylenediphenyl diisocyanate. The effect of the EO-PDMS-EO content on the properties of prepared polyurethanes was investigated by dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), swelling measurements, water contact angle and water absorption. Different techniques (FTIR peak deconvolution, DMTA and SEM) revealed that decrease of EO-PDMS-EO content promotes microphase separation in the synthesized polyurethanes. Samples synthesized with higher EO-PDMS-EO content have more hydrophobic surface and better waterproof performances, but lower crosslinking density. TGA results suggest that thermal stability of the synthesized polyurethane networks in nitrogen is significantly affected by the mutual influence of the crosslinking density and EO-PDMS-EO content. The results obtained in this work indicate that the synthesis of polyurethanes based on hyperbranched polyester and EO-PDMS-EO leads to the creation of networks with good thermal, thermomechanical and surface properties.
PB  - Elsevier
T2  - Journal of Non-Crystalline Solids
T1  - Analysis of dynamic mechanical, thermal and surface properties of poly(urethane-ester-siloxane) networks based on hyperbranched polyester
EP  - 3169
IS  - 23
SP  - 3161
VL  - 358
DO  - 10.1016/j.jnoncrysol.2012.09.013
ER  - 

@article{
author = "Džunuzović, Jasna and Pergal, Marija and Poreba, Rafal and Vodnik, Vesna and Simonović, Branislav and Spirkova, Milena and Jovanovic, Slobodan",
year = "2012",
abstract = "Six polyurethane networks were synthesized from Boltorn (R) hyperbranched polyester of the second pseudo generation, alpha,omega-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4'-methylenediphenyl diisocyanate. The effect of the EO-PDMS-EO content on the properties of prepared polyurethanes was investigated by dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), swelling measurements, water contact angle and water absorption. Different techniques (FTIR peak deconvolution, DMTA and SEM) revealed that decrease of EO-PDMS-EO content promotes microphase separation in the synthesized polyurethanes. Samples synthesized with higher EO-PDMS-EO content have more hydrophobic surface and better waterproof performances, but lower crosslinking density. TGA results suggest that thermal stability of the synthesized polyurethane networks in nitrogen is significantly affected by the mutual influence of the crosslinking density and EO-PDMS-EO content. The results obtained in this work indicate that the synthesis of polyurethanes based on hyperbranched polyester and EO-PDMS-EO leads to the creation of networks with good thermal, thermomechanical and surface properties.",
publisher = "Elsevier",
journal = "Journal of Non-Crystalline Solids",
title = "Analysis of dynamic mechanical, thermal and surface properties of poly(urethane-ester-siloxane) networks based on hyperbranched polyester",
pages = "3169-3161",
number = "23",
volume = "358",
doi = "10.1016/j.jnoncrysol.2012.09.013"
}

Džunuzović, J., Pergal, M., Poreba, R., Vodnik, V., Simonović, B., Spirkova, M.,& Jovanovic, S.. (2012). Analysis of dynamic mechanical, thermal and surface properties of poly(urethane-ester-siloxane) networks based on hyperbranched polyester. in Journal of Non-Crystalline Solids
Elsevier., 358(23), 3161-3169.
https://doi.org/10.1016/j.jnoncrysol.2012.09.013

Džunuzović J, Pergal M, Poreba R, Vodnik V, Simonović B, Spirkova M, Jovanovic S. Analysis of dynamic mechanical, thermal and surface properties of poly(urethane-ester-siloxane) networks based on hyperbranched polyester. in Journal of Non-Crystalline Solids. 2012;358(23):3161-3169.
doi:10.1016/j.jnoncrysol.2012.09.013 .

Džunuzović, Jasna, Pergal, Marija, Poreba, Rafal, Vodnik, Vesna, Simonović, Branislav, Spirkova, Milena, Jovanovic, Slobodan, "Analysis of dynamic mechanical, thermal and surface properties of poly(urethane-ester-siloxane) networks based on hyperbranched polyester" in Journal of Non-Crystalline Solids, 358, no. 23 (2012):3161-3169,
https://doi.org/10.1016/j.jnoncrysol.2012.09.013 . .

TY  - JOUR
AU  - Pavlicević, J.
AU  - Budinski-Simendić, Jaroslava
AU  - Radicević, R.
AU  - Katsikas, Lynne
AU  - Popović, Ivanka
AU  - Meszaros-Szecsenyi, K.
AU  - Spirkova, Milena
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1525
AB  - The objective of this study was to investigate the thermal stability of poly(urethane-isocyanurate) networks with increasing amount of dangling chains. In order to improve thermal stability of elastomeric materials, networks were prepared by adding some heat resistant isocyanurate rings as a junction points by catalytic cyclotrimerisation of telechelic diisocyanates. The thermal degradation kinetics of samples has been studied by means of high-resolution thermal analyzer SDT Q600 TA Instruments, under nitrogen atmosphere. The activation energy for the two step reactions of thermal decomposition of different species was calculated and compared.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Materials and Manufacturing Processes
T1  - Preparation and Thermal Stability of Elastomers Based on Irregular Poly(urethane-isocyanurate) Networks
EP  - 1223
IS  - 10-11
SP  - 1217
VL  - 24
DO  - 10.1080/10426910903022395
ER  - 

@article{
author = "Pavlicević, J. and Budinski-Simendić, Jaroslava and Radicević, R. and Katsikas, Lynne and Popović, Ivanka and Meszaros-Szecsenyi, K. and Spirkova, Milena",
year = "2009",
abstract = "The objective of this study was to investigate the thermal stability of poly(urethane-isocyanurate) networks with increasing amount of dangling chains. In order to improve thermal stability of elastomeric materials, networks were prepared by adding some heat resistant isocyanurate rings as a junction points by catalytic cyclotrimerisation of telechelic diisocyanates. The thermal degradation kinetics of samples has been studied by means of high-resolution thermal analyzer SDT Q600 TA Instruments, under nitrogen atmosphere. The activation energy for the two step reactions of thermal decomposition of different species was calculated and compared.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Materials and Manufacturing Processes",
title = "Preparation and Thermal Stability of Elastomers Based on Irregular Poly(urethane-isocyanurate) Networks",
pages = "1223-1217",
number = "10-11",
volume = "24",
doi = "10.1080/10426910903022395"
}

Pavlicević, J., Budinski-Simendić, J., Radicević, R., Katsikas, L., Popović, I., Meszaros-Szecsenyi, K.,& Spirkova, M.. (2009). Preparation and Thermal Stability of Elastomers Based on Irregular Poly(urethane-isocyanurate) Networks. in Materials and Manufacturing Processes
Taylor & Francis Inc, Philadelphia., 24(10-11), 1217-1223.
https://doi.org/10.1080/10426910903022395

Pavlicević J, Budinski-Simendić J, Radicević R, Katsikas L, Popović I, Meszaros-Szecsenyi K, Spirkova M. Preparation and Thermal Stability of Elastomers Based on Irregular Poly(urethane-isocyanurate) Networks. in Materials and Manufacturing Processes. 2009;24(10-11):1217-1223.
doi:10.1080/10426910903022395 .

Pavlicević, J., Budinski-Simendić, Jaroslava, Radicević, R., Katsikas, Lynne, Popović, Ivanka, Meszaros-Szecsenyi, K., Spirkova, Milena, "Preparation and Thermal Stability of Elastomers Based on Irregular Poly(urethane-isocyanurate) Networks" in Materials and Manufacturing Processes, 24, no. 10-11 (2009):1217-1223,
https://doi.org/10.1080/10426910903022395 . .