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  - Stefanović, Ivan S.
AU  - Džunuzović, Jasna V.
AU  - Džunuzović, Enis
AU  - Brzić, Saša J.
AU  - Jasiukaitytė-Grojzdek, Edita
AU  - Basagni, Andrea
AU  - Marega, Carla
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4803
AB  - A series of novel waterborne polyurethanes (WBPUs) was synthesized using alpha,omega-dihydroxypropyl poly(dimethylsiloxane) (PDMS), isophorone diisocyanate (IPDI), 2,2-bis-(hydroxymethyl) propionic acid (DMPA) and triethylamine (TEA). Different DMPA/PDMS molar ratio (from 0.2 to 0.7) and fixed -NCO/-OH molar ratio of 1.7, has been applied for the synthesis of six different WBPU films, without utilization of chain extension step during the synthesis. The structure of the prepared WBPUs was examined and confirmed by FTIR and NMR spectroscopy. The particle size of the prepared WBPU dispersions and molecular weight of WBPU films decrease with increasing DMPA content. In order to investigate the effect of the DMPA/PDMS ratio on thermal, mechanical and morphological properties, as well as the water resistance of the prepared WBPUs, diverse experimental techniques, such as thermogravimetric analysis, dynamic mechanical analysis, tensile tests, X-ray diffraction analysis (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM) and water contact angle measurements have been carried out. This research has shown that the incorporation of PDMS in WBPUs led to the appearance of microphase separation and provided surface hydrophobicity, good thermal and mechanical properties, which allow application of these WBPUs as coatings for various purposes.
T2  - Progress in Organic Coatings
T1  - Tailoring the properties of waterborne polyurethanes by incorporating different content of poly(dimethylsiloxane)
SP  - 106474
VL  - 161
DO  - 10.1016/j.porgcoat.2021.106474
ER  - 

@article{
author = "Stefanović, Ivan S. and Džunuzović, Jasna V. and Džunuzović, Enis and Brzić, Saša J. and Jasiukaitytė-Grojzdek, Edita and Basagni, Andrea and Marega, Carla",
year = "2021",
abstract = "A series of novel waterborne polyurethanes (WBPUs) was synthesized using alpha,omega-dihydroxypropyl poly(dimethylsiloxane) (PDMS), isophorone diisocyanate (IPDI), 2,2-bis-(hydroxymethyl) propionic acid (DMPA) and triethylamine (TEA). Different DMPA/PDMS molar ratio (from 0.2 to 0.7) and fixed -NCO/-OH molar ratio of 1.7, has been applied for the synthesis of six different WBPU films, without utilization of chain extension step during the synthesis. The structure of the prepared WBPUs was examined and confirmed by FTIR and NMR spectroscopy. The particle size of the prepared WBPU dispersions and molecular weight of WBPU films decrease with increasing DMPA content. In order to investigate the effect of the DMPA/PDMS ratio on thermal, mechanical and morphological properties, as well as the water resistance of the prepared WBPUs, diverse experimental techniques, such as thermogravimetric analysis, dynamic mechanical analysis, tensile tests, X-ray diffraction analysis (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM) and water contact angle measurements have been carried out. This research has shown that the incorporation of PDMS in WBPUs led to the appearance of microphase separation and provided surface hydrophobicity, good thermal and mechanical properties, which allow application of these WBPUs as coatings for various purposes.",
journal = "Progress in Organic Coatings",
title = "Tailoring the properties of waterborne polyurethanes by incorporating different content of poly(dimethylsiloxane)",
pages = "106474",
volume = "161",
doi = "10.1016/j.porgcoat.2021.106474"
}

Stefanović, I. S., Džunuzović, J. V., Džunuzović, E., Brzić, S. J., Jasiukaitytė-Grojzdek, E., Basagni, A.,& Marega, C.. (2021). Tailoring the properties of waterborne polyurethanes by incorporating different content of poly(dimethylsiloxane). in Progress in Organic Coatings, 161, 106474.
https://doi.org/10.1016/j.porgcoat.2021.106474

Stefanović IS, Džunuzović JV, Džunuzović E, Brzić SJ, Jasiukaitytė-Grojzdek E, Basagni A, Marega C. Tailoring the properties of waterborne polyurethanes by incorporating different content of poly(dimethylsiloxane). in Progress in Organic Coatings. 2021;161:106474.
doi:10.1016/j.porgcoat.2021.106474 .

Stefanović, Ivan S., Džunuzović, Jasna V., Džunuzović, Enis, Brzić, Saša J., Jasiukaitytė-Grojzdek, Edita, Basagni, Andrea, Marega, Carla, "Tailoring the properties of waterborne polyurethanes by incorporating different content of poly(dimethylsiloxane)" in Progress in Organic Coatings, 161 (2021):106474,
https://doi.org/10.1016/j.porgcoat.2021.106474 . .