TY  - JOUR
AU  - Stefanović, Ivan S.
AU  - Džunuzović, Jasna V.
AU  - Džunuzović, Enis S.
AU  - Ranđelović, Danijela V.
PY  - 2024
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",
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). 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):e54989,
https://doi.org/10.1002/app.54989 . .

TY  - JOUR
AU  - Džunuzović, Jasna V.
AU  - Stefanović, Ivan S.
AU  - Džunuzović, Enis S.
AU  - Basagni, Andrea
AU  - Marega, Carla
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7471
AB  - In this paper, thermal and thermo-oxidative stability of three water-based polyurethanes (PUs) derived from hydroxypropyl terminated poly(dimethylsiloxane) (HPT-PDMS) were studied. The structural properties of the synthesized samples were investigated by 1H NMR measurements, while characterization of their surface, performed by atomic force microscopy, revealed the existence of microphase-separated structures. According to the results obtained by thermogravimetric analysis (TGA), thermo-oxidative and thermal stability of the investigated water-based PUs decreases with decreasing HPT-PDMS content. Furthermore, obtained results also suggest that both, thermo-oxidative and thermal degradation reaction of water-based PUs occurred as a three-step process. In both atmospheres the first step of degradation is attributed to the degradation of weak urethane and urea bonds and the second step to the decomposition of polysiloxane chains. In order to undertake a detail investigation of thermal degradation process of water-based PUs, TG measurements in nitrogen atmosphere at four different heating rates (5, 10, 15 and 20 °C/min) were performed. Different iso-conversional model-free methods, such as Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose and Friedman, were applied to determine apparent activation energy of thermal degradation reaction (Ea) of water-based PUs, at different conversions (α). Deviation in parallelism of the obtained fitted lines confirmed that thermal degradation reaction of water-based PUs occurred in three successive steps, followed by different degradation mechanism. Since linear fitting of the experimental data by Friedman method had the lowest correlation coefficient, Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose methods were considered to be the most reliable for Ea calculation. A comprehensive analysis of the obtained results revealed that, despite their similar structure, each water-based PU shows unique profile of Ea = f(α) plot.
PB  - Springer Science and Business Media B.V.
T2  - Journal of Polymer Research
T1  - Study on thermal stability of water-based polyurethanes derived from hydroxypropyl terminated poly(dimethylsiloxane)
IS  - 5
SP  - 139
VL  - 31
DO  - 10.1007/s10965-024-03982-w
ER  - 

@article{
author = "Džunuzović, Jasna V. and Stefanović, Ivan S. and Džunuzović, Enis S. and Basagni, Andrea and Marega, Carla",
year = "2024",
abstract = "In this paper, thermal and thermo-oxidative stability of three water-based polyurethanes (PUs) derived from hydroxypropyl terminated poly(dimethylsiloxane) (HPT-PDMS) were studied. The structural properties of the synthesized samples were investigated by 1H NMR measurements, while characterization of their surface, performed by atomic force microscopy, revealed the existence of microphase-separated structures. According to the results obtained by thermogravimetric analysis (TGA), thermo-oxidative and thermal stability of the investigated water-based PUs decreases with decreasing HPT-PDMS content. Furthermore, obtained results also suggest that both, thermo-oxidative and thermal degradation reaction of water-based PUs occurred as a three-step process. In both atmospheres the first step of degradation is attributed to the degradation of weak urethane and urea bonds and the second step to the decomposition of polysiloxane chains. In order to undertake a detail investigation of thermal degradation process of water-based PUs, TG measurements in nitrogen atmosphere at four different heating rates (5, 10, 15 and 20 °C/min) were performed. Different iso-conversional model-free methods, such as Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose and Friedman, were applied to determine apparent activation energy of thermal degradation reaction (Ea) of water-based PUs, at different conversions (α). Deviation in parallelism of the obtained fitted lines confirmed that thermal degradation reaction of water-based PUs occurred in three successive steps, followed by different degradation mechanism. Since linear fitting of the experimental data by Friedman method had the lowest correlation coefficient, Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose methods were considered to be the most reliable for Ea calculation. A comprehensive analysis of the obtained results revealed that, despite their similar structure, each water-based PU shows unique profile of Ea = f(α) plot.",
publisher = "Springer Science and Business Media B.V.",
journal = "Journal of Polymer Research",
title = "Study on thermal stability of water-based polyurethanes derived from hydroxypropyl terminated poly(dimethylsiloxane)",
number = "5",
pages = "139",
volume = "31",
doi = "10.1007/s10965-024-03982-w"
}

Džunuzović, J. V., Stefanović, I. S., Džunuzović, E. S., Basagni, A.,& Marega, C.. (2024). Study on thermal stability of water-based polyurethanes derived from hydroxypropyl terminated poly(dimethylsiloxane). in Journal of Polymer Research
Springer Science and Business Media B.V.., 31(5), 139.
https://doi.org/10.1007/s10965-024-03982-w

Džunuzović JV, Stefanović IS, Džunuzović ES, Basagni A, Marega C. Study on thermal stability of water-based polyurethanes derived from hydroxypropyl terminated poly(dimethylsiloxane). in Journal of Polymer Research. 2024;31(5):139.
doi:10.1007/s10965-024-03982-w .

Džunuzović, Jasna V., Stefanović, Ivan S., Džunuzović, Enis S., Basagni, Andrea, Marega, Carla, "Study on thermal stability of water-based polyurethanes derived from hydroxypropyl terminated poly(dimethylsiloxane)" in Journal of Polymer Research, 31, no. 5 (2024):139,
https://doi.org/10.1007/s10965-024-03982-w . .

TY  - JOUR
AU  - Džunuzović, Jasna V.
AU  - Pergal, Marija V.
AU  - Jovanović, Slobodan
AU  - Vodnik, Vesna
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5659
AB  - A series of six polyurethane (PU) networks was synthesized from Boltorn (R) hydroxy-functional hyperbranched polyester (HBP) of the second pseudo generation as a cross-linking agent, alpha,omega-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4-methylenediphenyl diisocyanate, by two-step polymerization in solution. Each sample of the prepared PUs had different EO-PDMS-EO content. The chemical structure of the synthesized networks was analyzed by FTIR spectroscopy. The influence of the EO-PDMS-EO content and type of the solvent on the swelling behavior of the PUs in 2-propanol and toluene was investigated. During the swelling measurements, a certain amount of sal fractions was extracted from the PUs by solvents. According to the H-1-NMR results, sal fractions were mainly composed of the soluble hyperbranched PU, formed during the polymerization by partial modification of the end hydroxyl groups of HBP with NCO-terminated prepolymer synthesized in the first step of the reaction. Chains of the so reacted prepolymer can then fold back and form cyclic products by reaction of the free -NCO group from the NCO-terminated prepolymer with free -OH group of HBP. As the EO-PDMS-EO content increases the amount of the sol fractions and swelling degree also increased, indicating that networks with lower EO-PDMS-EO content are more cross-linked and have higher solvent resistance.
T2  - Hemijska industrija
T1  - Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer
EP  - 644
IS  - 6
SP  - 637
VL  - 65
DO  - 10.2298/HEMIND110902071D
ER  - 

@article{
author = "Džunuzović, Jasna V. and Pergal, Marija V. and Jovanović, Slobodan and Vodnik, Vesna",
year = "2011",
abstract = "A series of six polyurethane (PU) networks was synthesized from Boltorn (R) hydroxy-functional hyperbranched polyester (HBP) of the second pseudo generation as a cross-linking agent, alpha,omega-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4-methylenediphenyl diisocyanate, by two-step polymerization in solution. Each sample of the prepared PUs had different EO-PDMS-EO content. The chemical structure of the synthesized networks was analyzed by FTIR spectroscopy. The influence of the EO-PDMS-EO content and type of the solvent on the swelling behavior of the PUs in 2-propanol and toluene was investigated. During the swelling measurements, a certain amount of sal fractions was extracted from the PUs by solvents. According to the H-1-NMR results, sal fractions were mainly composed of the soluble hyperbranched PU, formed during the polymerization by partial modification of the end hydroxyl groups of HBP with NCO-terminated prepolymer synthesized in the first step of the reaction. Chains of the so reacted prepolymer can then fold back and form cyclic products by reaction of the free -NCO group from the NCO-terminated prepolymer with free -OH group of HBP. As the EO-PDMS-EO content increases the amount of the sol fractions and swelling degree also increased, indicating that networks with lower EO-PDMS-EO content are more cross-linked and have higher solvent resistance.",
journal = "Hemijska industrija",
title = "Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer",
pages = "644-637",
number = "6",
volume = "65",
doi = "10.2298/HEMIND110902071D"
}

Džunuzović, J. V., Pergal, M. V., Jovanović, S.,& Vodnik, V.. (2011). Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer. in Hemijska industrija, 65(6), 637-644.
https://doi.org/10.2298/HEMIND110902071D

Džunuzović JV, Pergal MV, Jovanović S, Vodnik V. Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer. in Hemijska industrija. 2011;65(6):637-644.
doi:10.2298/HEMIND110902071D .

Džunuzović, Jasna V., Pergal, Marija V., Jovanović, Slobodan, Vodnik, Vesna, "Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer" in Hemijska industrija, 65, no. 6 (2011):637-644,
https://doi.org/10.2298/HEMIND110902071D . .