Structures and Properties of Polyimide with Different Pre-imidization Degrees  

作　　者：Fu-Yao Hao Jian-Hua Wang Sheng-Li Qi Guo-Feng Tian De-Zhen Wu 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Chinese Journal of Polymer Science》2020年第8期840-846,I0006,共8页高分子科学（英文版）

基　　金：This work was financially supported by the National Key Research and Development Program of China(No.2017YFB0308103);the National Natural Science Foundation of China(No.51773007);the Fundamental Research Funds for the Central Universities(No.XK1802-2).

摘　　要：A series of polyimide(PI)films derived from pyromellitic dianhydride(PMDA)and 4,4'-oxydianiline(ODA)were prepared with the employment of chemical pre-imidization,and the pre-imidization degree(pre-ID)was found influential on structures and properties of the films obtained.Specifically,a certain degree of chemical imidization could promote the in-plane orientation of molecular chains inside the film,which then enhanced the mechanical strength and reduced the coefficient of thermal expansion(CTE)of the films.Further,such pre-imidization process could expand the internal space gap inside the films,thereby lowering their dielectric constant and glass transition temperature.Our study provides a new approach for preparing high-performance PI films through chemical imidization.

关 键 词：POLYIMIDE Pre-imidization Stacking model In-plane orientation 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]