TY  - JOUR
AU  - Vuković, Jasna
AU  - Jovanovic, Slobodan
AU  - Lechner, Manfred D.
AU  - Vodnik, Vesna
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3673
AB  - Rheological behavior in melt of aliphatic hyperbranched polyesters (AHBP), synthesized using pseudo-one-step and one-step procedure, was investigated in this work. Three commercially available AHBP were also examined. Because of the presence of relatively strong hydrogen bonds between numerous end hydroxyl groups, AHBP of lower generation number, as well as the sample of tenth pseudo generation, show non-Newtonian behavior in the entire investigated frequency and temperature region. However, for other examined AHBP, the slope of the frequency dependence of complex viscosity (eta* = f(omega)) becomes smaller with the temperature increase. Therefore, samples of fourth, fifth, and sixth pseudo generations show Newtonian behavior at temperatures higher than 70 degrees C. Value of glass transition temperature, melt flow activation energy, fractional free volume, and thermal expansion coefficient were determined for the investigated AHBP. The influence of the type of end groups on rheological properties of AHBP was also examined. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2925-2934, 2009
T2  - Journal of Applied Polymer Science
T1  - Melt Rheology of Aliphatic Hyperbranched Polyesters
VL  - 112
IS  - 5
SP  - 2925
EP  - 2934
DO  - 10.1002/app.29836
ER  - 

@article{
author = "Vuković, Jasna and Jovanovic, Slobodan and Lechner, Manfred D. and Vodnik, Vesna",
year = "2009",
abstract = "Rheological behavior in melt of aliphatic hyperbranched polyesters (AHBP), synthesized using pseudo-one-step and one-step procedure, was investigated in this work. Three commercially available AHBP were also examined. Because of the presence of relatively strong hydrogen bonds between numerous end hydroxyl groups, AHBP of lower generation number, as well as the sample of tenth pseudo generation, show non-Newtonian behavior in the entire investigated frequency and temperature region. However, for other examined AHBP, the slope of the frequency dependence of complex viscosity (eta* = f(omega)) becomes smaller with the temperature increase. Therefore, samples of fourth, fifth, and sixth pseudo generations show Newtonian behavior at temperatures higher than 70 degrees C. Value of glass transition temperature, melt flow activation energy, fractional free volume, and thermal expansion coefficient were determined for the investigated AHBP. The influence of the type of end groups on rheological properties of AHBP was also examined. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2925-2934, 2009",
journal = "Journal of Applied Polymer Science",
title = "Melt Rheology of Aliphatic Hyperbranched Polyesters",
volume = "112",
number = "5",
pages = "2925-2934",
doi = "10.1002/app.29836"
}

Vuković, J., Jovanovic, S., Lechner, M. D.,& Vodnik, V.. (2009). Melt Rheology of Aliphatic Hyperbranched Polyesters. in Journal of Applied Polymer Science, 112(5), 2925-2934.
https://doi.org/10.1002/app.29836

Vuković J, Jovanovic S, Lechner MD, Vodnik V. Melt Rheology of Aliphatic Hyperbranched Polyesters. in Journal of Applied Polymer Science. 2009;112(5):2925-2934.
doi:10.1002/app.29836 .

Vuković, Jasna, Jovanovic, Slobodan, Lechner, Manfred D., Vodnik, Vesna, "Melt Rheology of Aliphatic Hyperbranched Polyesters" in Journal of Applied Polymer Science, 112, no. 5 (2009):2925-2934,
https://doi.org/10.1002/app.29836 . .

TY  - JOUR
AU  - Vuković, Jasna
AU  - Pergal, Marija V.
AU  - Jovanovic, Slobodan
AU  - Vodnik, Vesna
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3638
AB  - In this paper, two samples of polyurethane (PU) crosslinked with hydroxy-functonal hyperbranched aliphatic polyester of the second pseudo generation were investigated. For the synthesis of these crosslinked PUs two different macrodiols were used: poly(tetramethyleneoxide) (PTMO) for PUPTMO and ethylene oxide-poly(dimethylsiloxane)-ethylene oxide (PDMS-EO) for PUPDMS-EO sample, Synthesized samples behave as elastomers and have yellow color. Obtained results show that swelling degree of the sample PUPDMS-EO in N-methyl-2-pyrrolidinon (NMP) determined at room temperature is higher than for the sample PUPTMO. It has been also observed that thermal properties of these polyurethane networks can be changed by incorporation of siloxane sequences in their structure.
T2  - Hemijska industrija
T1  - Crosslinked Polyurethanes Based on Hyperbranched Polymers
VL  - 62
IS  - 6
SP  - 353
EP  - 359
DO  - 10.2298/HEMIND0806353V
ER  - 

@article{
author = "Vuković, Jasna and Pergal, Marija V. and Jovanovic, Slobodan and Vodnik, Vesna",
year = "2008",
abstract = "In this paper, two samples of polyurethane (PU) crosslinked with hydroxy-functonal hyperbranched aliphatic polyester of the second pseudo generation were investigated. For the synthesis of these crosslinked PUs two different macrodiols were used: poly(tetramethyleneoxide) (PTMO) for PUPTMO and ethylene oxide-poly(dimethylsiloxane)-ethylene oxide (PDMS-EO) for PUPDMS-EO sample, Synthesized samples behave as elastomers and have yellow color. Obtained results show that swelling degree of the sample PUPDMS-EO in N-methyl-2-pyrrolidinon (NMP) determined at room temperature is higher than for the sample PUPTMO. It has been also observed that thermal properties of these polyurethane networks can be changed by incorporation of siloxane sequences in their structure.",
journal = "Hemijska industrija",
title = "Crosslinked Polyurethanes Based on Hyperbranched Polymers",
volume = "62",
number = "6",
pages = "353-359",
doi = "10.2298/HEMIND0806353V"
}

Vuković, J., Pergal, M. V., Jovanovic, S.,& Vodnik, V.. (2008). Crosslinked Polyurethanes Based on Hyperbranched Polymers. in Hemijska industrija, 62(6), 353-359.
https://doi.org/10.2298/HEMIND0806353V

Vuković J, Pergal MV, Jovanovic S, Vodnik V. Crosslinked Polyurethanes Based on Hyperbranched Polymers. in Hemijska industrija. 2008;62(6):353-359.
doi:10.2298/HEMIND0806353V .

Vuković, Jasna, Pergal, Marija V., Jovanovic, Slobodan, Vodnik, Vesna, "Crosslinked Polyurethanes Based on Hyperbranched Polymers" in Hemijska industrija, 62, no. 6 (2008):353-359,
https://doi.org/10.2298/HEMIND0806353V . .