Synthesis of soluble polyimides for vertical alignment of liquid crystal via one-step method

被引：30

作者：

Fang, Yu-Qing ^{[1
]}

Wang, Jian ^{[1
]}

Zhang, Qin ^{[1
]}

Zeng, Yu ^{[1
]}

Wang, Ying-Han ^{[1
]}

机构：

[1] Sichuan Univ, State Key Lab Polymer Mat Engn China, Coll Polymer Sci & Engn, Chengdu 610065, Peoples R China

来源：

EUROPEAN POLYMER JOURNAL | 2010年 / 46卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Polyimides; Solution properties; Copolymerization; Vertical alignment; Liquid crystal; SIDE-CHAINS; POLYPYROMELLITIMIDES; ANGLE;

D O I：

10.1016/j.eurpolymj.2009.12.021

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 (Pis) were copolymerized from 4-dodecyloxy-biphenyl-3',5'-diaminobenzoate (DBPDA), 3,3'-dimethy1-4,4'-methylene-dianiline (DMMDA) and 4,4'-oxydi(phthalic anhydride) (ODPA) via one-step method. The Pls possessed excellent solubility in polar aprotic solvents and easily formed thin flexible films by solution casting. The glass-transition temperatures (T(g)s) of the Pls were in the range of 219-242 degrees C and thermal decomposition temperatures in nitrogen occurred above 350 degrees C. The resultant PI films exhibited high transparency at wavelengths greater than 400 nm and induced excellent uniform vertical alignment of liquid crystal (LC). Even after the rubbing process, the pretilt angles of LC were still above 89. The PI seems to be a prospective material for alignment layers in flexible displays. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1163 / 1167

页数：5

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