Melt Rheology of Aliphatic Hyperbranched Polyesters
Апстракт
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 rheologica...l properties of AHBP was also examined. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2925-2934, 2009
Кључне речи:
hyperbranched / polyesters / rheology / activation energyИзвор:
Journal of Applied Polymer Science, 2009, 112, 5, 2925-2934
DOI: 10.1002/app.29836
ISSN: 0021-8995
WoS: 000265076100040
Scopus: 2-s2.0-64249169312
Колекције
Институција/група
VinčaTY - 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 . .