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Glass transition behavior of hyper-branched polystyrenes

✍ Scribed by Kei-ichi Akabori; Hironori Atarashi; Masaaki Ozawa; Tetsuo Kondo; Toshihiko Nagamura; Keiji Tanaka

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
815 KB
Volume
50
Category
Article
ISSN
0032-3861

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## Abstract **Summary:** A unified model is developed for the finite size‐effect on the glass‐transition temperature of polymers, __T__~g~(__D__), where __D__ denotes the diameter of particles or thickness of films. In terms of this model, __T__~g~ depends on both the size and interface conditions.

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A quantitative explanation is given for the apparent viscosity increase with increasing capillary shear rate for polystyrene at temperatures approaching the glass transition, T,. Possible shifts in T, as a function of the parameters shear rate, frequency, and pressure are interrelated to viscosity