Effect of Low-temperature Imidization on Properties and Aggregation Structures of Polyimide Films with Different Rigidity

作     者：Yan Jia Lei Zhai Song Mo Yi Liu Li-Xin Liu Xin-Yu Du Min-Hui He Lin Fan 

作者机构：Key Laboratory of Science and Technology on High-tech Polymer MaterialsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2024年第42卷第8期

页      面：1134-1146页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：financially supported by the National Key Research and Development Program of China(No.2022YFB3603105) Key Programs of the Chinese Academy of Sciences(No.ZDRW-CN-2023-3-2) the National Natural Science Foundation of China(No.51803221) Natural Science Foundation of Beijing Municipality(No.2202068) 

主　　题：Polyimide Imidization Catalyst Structure and properties Aggregation structures 

摘      要：The traditional high-temperature preparation process of polyimide can cause many problems and limits the wider application in extreme *** important challenge to be solved urgently is the reduction of imidization *** this work,twelve kinds of polyimide films with different chain rigidity were prepared at low temperature of 200℃,in the absence or presence of imidazole used as the *** molecular rigidity and free volume were theoretically calculated,and relationship between structure and properties were systematically *** results show that imidization reaction under low temperatures is significantly affected by the rigidity of molecula r *** rigid structure of polyimide is not conducive to the low-temperature imidization,but this adverse effect can be eliminated by adding catalyst,resulting the notably increased imidization *** optical and thermal properties can be improved to a certain extent for the chemically catalyzed system,resulting in relatively higher heat resistance and thermal *** the mechanical performance could be determined by com plicating factors,greatly different from polyimide films prepa red by high temperature *** investigate aggregation structures of film s,the effect of chain rigidity and catalyst on the stacking or orientation of molecular chains was further *** wo rk can contribute to the understanding of chemically catalyzed imidization that is rarely reported in the existing research,and will provide guidance for the low-temperature preparation of high-performance polyimides.