Melt rheology of aliphatic hyperbranched polyesters

被引：0

作者：

Vukovic, Jasna ^{[1
]}

Jovanovic, Slobodan ^{[2
]}

Lechner, Manfred D. ^{[3
]}

Vodnik, Vesna ^{[4
]}

机构：

[1] ICTM-Center for Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia

[2] Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia

[3] Institute for Chemistry, University of Osnabrueck, Barbarastraße 7, 49069 Osnabrueck, Germany

[4] Institute of Nuclear Science Vinca, P.O. Box 522, 11001 Belgrade, Serbia

来源：

Journal of Applied Polymer Science | 2009年 / 112卷 / 05期

关键词：

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 (η* = f(ω)) becomes smaller with the temperature increase. Therefore; samples of fourth; fifth; and sixth pseudo generations show Newtonian behavior at temperatures higher than 70C. 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 rheologiral properties of AHBP was also examined. © 2009 Wiley Periodicals; Inc;

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摘要：

Journal article (JA)

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页码：2925 / 2934