VISCOELASTIC PROPERTIES OF AMORPHOUS POLYMERS .1. DIFFERENT TEMPERATURE DEPENDENCES OF SEGMENTAL RELAXATION AND TERMINAL DISPERSION

被引:108
作者
PLAZEK, DJ
ZHENG, XD
NGAI, KL
机构
[1] USN,RES LAB,WASHINGTON,DC 20375
[2] UNIV PITTSBURGH,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15261
关键词
D O I
10.1021/ma00045a016
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Two drastically different temperature dependences of the segmental relaxation and terminal dispersion previously observed in entangled polystyrene, poly(vinylacetate), and polypropylene were explained before in the framework of the coupling model as due to the large difference between the segmental motion coupling parameter, n(alpha), and the entanglement coupling parameter, n(eta), in these polymers, with n(alpha) being significantly larger. The n(alpha) for a polyisobutylene was found recently to be the smallest among amorphous polymers, and its value is comparable to that of n(eta). As a consequence the coupling model requires that the temperature dependences for segmental relaxation (near the glassy level) and the terminal dispersion be similar. Viscoelastic measurements were carried out in a high molecular weight (entangled) polyisobutylene sample to verify this clear prediction. The experimental results presented here have borne out the theoretical expectations.
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页码:4920 / 4924
页数:5
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