可溶性聚酰亚胺液晶取向膜的制备与性能  

Preparation and Properties of Soluble Polyimides as the Liquid Crystal Alignment Layer

作　　者：文璞山 何瑞 赵光练 梁兴 李明勳 WEN Pushan;HE Rui;ZHAO Guanglian;LIANG Xing;LEE Myonghoon(School of Chemistry and Chemical Engineering,Zunyi Normal University,Zunyi,Guizhou 563006,China;Wuhan China Star Optoelectronics Technology Co.,Ltd.,Wuhan 430078,China;Graduate School of Flexible and Printable Electronics,Jeonbuk National University,Jeonju 54896,Korea)

机构地区：[1]遵义师范学院化学化工学院,贵州遵义563006 [2]武汉华星光电技术有限公司,武汉430078 [3]韩国全北大学柔韧印刷电子研究生院,韩国全州54896

出　　处：《应用化学》2020年第12期1403-1410,共8页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(21766040);贵州省科技厅科学技术基金(黔科合基础[2016]1419);贵州省教育厅自然科学研究项目(黔教合KY字[2019]058);韩国教育部国家研究基金基础科学研究项目(2018R1D1A1B07044250)资助。

摘　　要：液晶取向膜是液晶显示器中的关键材料,为了制得性能优良的液晶取向膜,我们通过铃木偶联反应制备了3种含有不同末端基团的3,5-二氨基联苯,将制得的3种二胺单体分别与环丁烷四甲酸二酐聚合得到3种新型的聚酰亚胺。利用核磁氢谱对单体和聚合物的结构进行了表征,测试了聚合物的溶解性、热稳定性以及用作液晶取向膜的性能。结果表明,所得的聚酰亚胺具有良好的溶解性和热稳定性,经过机械摩擦后,末端带有甲氧基的聚酰亚胺能使液晶分子平行于摩擦方向取向,末端带有苯氧羰基和联苯氧羰基的聚酰亚胺能使液晶分子垂直于摩擦方向取向。此类可溶性的聚酰亚胺液晶取向膜将简化制备工艺并在柔性显示器件中具有较大的应用价值。The liquid crystal alignment layer plays a critical role in the liquid crystal display.In order to prepare liquid crystal alignment layer with excellent properties,three kinds of 3,5-diaminobiphenyls with different terminal groups were synthesized by Suzuki coupling reaction,and three polyimides were prepared by polymerization of the three diamines with 1,2,3,4-cyclobutanetetracarboxylic dianhydride.The structures of monomers and polymers were characterized by proton nuclear magnetic resonance(1 H NMR)spectroscopy.The solubility,thermal stability and properties of the polymers as liquid crystal alignment layer were studied.The resulting polyimides show good solubility and thermal stability.After rubbing,the polyimide with methoxy as terminal group can align the liquid crystal molecules parallel to the rubbing direction.On the contrary,the polyimides with phenoxycarbonyl and biphenoxycarbonyl as terminal groups align the liquid crystal molecules perpendicular to the rubbing direction.This kind of soluble polyimide liquid crystal alignment film will simplify the preparation process and present great application value in flexible display devices.

关 键 词：聚酰亚胺 取向膜 溶解性 热稳定性 

分 类 号：O633[理学—高分子化学]