Synthesis and Properties of a Novel Polyimide with Side Chain Containing Biphenyl Unit

作     者：WANG Xu CHANG Tong-xin ZHANG Peng CHEN Yi LIU Xiang-yang 

作者机构：State Key Laboratory of Polymeric Materials EngineeringCollege of Polymer Science and EngineeringSichuan UniversityChengdu 610065P.R.China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2012年第28卷第2期

页      面：334-339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] 0703[理学-化学] 0702[理学-物理学] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.50773044 50973073) 

主　　题：Polyimide Alignment film Liquid crystal Biphenyl side chain 

摘      要：A novel biphenyl side-chained diamine with alkyloxy spacer and alkyloxy tail,4＇-butoxy-4-（3,5-diaminobenzoyloxy）hexyloxybiphenyl（C6BBC4）,was synthesized and characterized by FTIR and 1 H NMR.A series of polyimide（PI） films with different side chain contents was synthesized from biphenyltetracarboxylicdianhydride（BPDA）,4,4＇-oxydianiline（ODA） and C6BBC4,and their thermal properties,optical transparency and liquid crystal alignment property,and so on,were investigated by thermogravimetric analysis（TGA）,differential scanning calorimetry（DSC）,crystal rotation method,polarizing microscopy and UV-Vis *** the content of side chained diamine increasing from 0 to 100%,the η inh of poly（amide acid）（PAA） decreased rapidly from 3.0 to 0.51,the glass transition temperature（T g） of polyimides（PIs） decreased from 274 ℃ to 203 ℃ and the Vis-light transmittance of alignment films substantially *** for the alignment properties,the pretilt angle of PI alignment films without rubbing could reach 90° when the content of C6BBC4 was 60% or *** the same time,the alignment stability could meet the industrial *** was considered that the alkoxy spacer,the biphenyl unit and the alkoxy tail may all play important roles in achieving a large pretilt angle even up to 90°,and the introduction of only the alkoxy spacer or alkoxy tail can also improve the pretilt angle,but not by much.