STRUCTURE AND THERMAL MECHANICAL PROPERTIES OF ORIENTED POLYIMIDE (PEI-E)  

作　　者：孙振华 庄宇钢 李诗春 丁孟贤 冯之榴 

机构地区：[1]Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Academia Sinica, Changchun, Jilin, 130022 [2]Formerly E. T. L. Voong and Voong Tse-Lieu.

出　　处：《Chinese Journal of Polymer Science》1992年第2期145-151,共7页高分子科学（英文版）

摘　　要：The strain induced crystallization behaviour in polyimide from 1,4-bis (3', 4'- dicarboxyphenoxy)benzene and 4,4'-oxydianiline (PEI-E)has been investigated by WAXD, DSC and FTIR. The results obtained show that crystallization in PEI-E did take place just after tensile yielding. Meanwhile, the effect of strain induced crystallization on the thermomechanical properties was studied by DMA and TMA, the results of which indicate that the crystallization and hot stretching have a certain influence on the dynamic mechanical properties, such as weakening the β relaxation and decreasing the glass transition temperature. The TMA results confirm the shifting of glass transition temperature to lower temperature region after hot stretching. This phenomenon could be well explained by the effect of residual stress according to Eyring's theory.The strain induced crystallization behaviour in polyimide from 1,4-bis (3', 4'- dicarboxyphenoxy)benzene and 4,4'-oxydianiline (PEI-E)has been investigated by WAXD, DSC and FTIR. The results obtained show that crystallization in PEI-E did take place just after tensile yielding. Meanwhile, the effect of strain induced crystallization on the thermomechanical properties was studied by DMA and TMA, the results of which indicate that the crystallization and hot stretching have a certain influence on the dynamic mechanical properties, such as weakening the β relaxation and decreasing the glass transition temperature. The TMA results confirm the shifting of glass transition temperature to lower temperature region after hot stretching. This phenomenon could be well explained by the effect of residual stress according to Eyring's theory.

关 键 词：POLYIMIDE Strain induced crystallization Thermal mechanical property 

分 类 号：O63[理学—高分子化学]