Synthesis of novel hyperbranched polyimide for liquid crystal alignment

被引：13
|
作者：
Zhang, Qin [1 ]
He, Jie [1 ]
Fang, Yu-Qing [1 ]
Wang, Ying-Han [1 ]
机构：
[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn China, Chengdu 610065, Peoples R China
来源：
LIQUID CRYSTALS | 2008年 / 35卷 / 04期
基金：
中国国家自然科学基金;
关键词：
hyperbranched polyimide; linear polyimide; liquid crystal alignment; pretilt angle;
D O I：
10.1080/02678290801932876
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A novel hyperbranched polyimide (HPPI) was synthesized from a new four-functional amine and 1,2,3,4-cyclobutanetetracarboxylic dianhydride. The polyimide with hyperbranched structure exhibited excellent alignment for nematic liquid crystal (LC) compared with traditional linear polyimides. The solution viscosities of the poly(amic acids) (PAAs) and the surface morphology of PI films were investigated using an Ubbelhode-type viscometer and atomic force microscopy, respectively. The viscosities of the hyperbranched PAAs were much lower than that of the linear PAA solution at any monomer ratio (amine: dianhydride). Pretilt angles of LCs above 2.8 degrees were achieved with HPPI.
引用
收藏
页码：385 / 388
页数：4
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