Diamine and polyamic acid derived therefrom for liquid crystal orientation applications

摘要

A diamine includes a structure of formula (I), wherein X and Y are independently a divalence group selected from the group consisting of: -O-, -(C-O)-O-, -O-(C-O)-, -(C-O)-NH-, and -NH-(C-O)-; and R has a structure of formula (II): wherein R¹, R², R³, R⁴, R⁵, m, and n are as defined in Claim 1. A polyamic acid is prepared by reacting a diamine reactant including the aforesaid diamine of formula (I) with a tetracarboxylic dianhydride reactant. A liquid crystal orienting film contains a polyimide converted from the aforesaid polyamic acid.