BETA-RELAXATION IN POLYIMIDES

被引：72

作者：

SUN, ZH

DONG, LS

ZHUANG, YG

CAO, LY

DING, MX

FENG, ZL

机构：

[1] Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Academia Sinica, Changchun

来源：

POLYMER | 1992年 / 33卷 / 22期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

BETA-RELAXATION; POLYIMIDES; DYNAMIC MECHANICAL ANALYSIS; SYNTHESIS;

D O I：

10.1016/0032-3861(92)90684-O

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A series of polyimides with different structures have been synthesized and studied by dynamic mechanical analysis. The results obtained indicate that the beta relaxation in polyimides is related to the rotation of rigid segment(s) of p-phenylene and imide groups around 'hinges' such as -O-, -CH2- and so on in diamines. It is noticed that two kinds of polyimides both with [GRAPHICS] imide groups have verv weak beta relaxation below the glass transition temperature. This phenomenon is due to the fact that the configuration of chains with the above imide groups hinders the rotation of the rigid segments in the chains.

引用

页码：4728 / 4731

页数：4