液晶与显示2013，Vol.28Issue(1)：19-24,6.DOI:10.3788/YJYXS20132801.0019
侧链密度对聚酰亚胺取向膜性能的影响
Effect of Side Chain Density of Polyimides on Properties of Liquid Crystal Alignment Film
摘要
Abstract
4-dodecyloxy-phenyl-4',4"-diaminotriphenylamine (DPDTA) containing triphenylamine were successfully synthesized. Polyimides (PIs) containing triphenylamine units in the main chain were synthesized with the co-condensation of DMMDA,DPDTA and aromatic dianhydride 4 ,4'- oxydiphthalic anhydride (ODPA) by thermal imidization. The structures of the PIs were confirmed by FT-IR. The alignment behavior of PIs as liquid crystal alignment layers was also examined with polarized optical micrograph (POM). The properties of the PIs were characterized by TGA,UV-Vis and DSC etc. It was found that side chain density of PIs had important influence on properties of liquid crystal alignment film. Before rubbing,PI containing 25% DPDTA could induce uniform vertical alignment and a pretilt angle of 89. 7°. The liquid crystal was not aligned on the surface of PI film which contained 10% DPDTA without the rubbing treatment. After the rubbing process,the pretilt angle of liquid crystal was 2. 4,when PI film contained 25% DPDTA and the pretilt angle of liquid crystal was 1. 8% when PI contained 10% DPDTA. The transmittances of the Pis in 500~800 nm wavelengths are more than 80%,and their glass transition temperatures are above 230 ℃.关键词
聚酰亚胺/液晶取向剂/侧链/构象/预倾角Key words
polyimide/ liquid crystal alignment/ side chain/ conformation/ pretilt angle分类
数理科学引用本文复制引用
刘明,孙振,汪映寒..侧链密度对聚酰亚胺取向膜性能的影响[J].液晶与显示,2013,28(1):19-24,6.基金项目
国家自然科学基金(No.50973067,51173115,21172161) （No.50973067,51173115,21172161）
教育部留学回国人员科研启动基金(No.20071108-18-12) （No.20071108-18-12）
博士点基金(No.20110181110030) （No.20110181110030）
