The effect of phthalimide side chains on the thermal stability and rubbing resistance of polyimide used as a liquid crystal vertical alignment layer

被引：13

作者：

Xia, Senlin ^{[1
]}

Yi, Longfei ^{[1
]}

Sun, Zhen ^{[1
]}

Wang, Yinghan ^{[1
]}

机构：

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

来源：

JOURNAL OF POLYMER RESEARCH | 2013年 / 20卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Polyimides; Liquid crystal; Alignment layer; Thermal stability; AROMATIC POLYAMIDES; OPTICAL-PROPERTIES; DIANHYDRIDE; 2,2-BIS(TRIFLUOROMETHYL)-4,4-DIAMINOBIPHENYL; TRANSPARENT; ANHYDRIDE; DIAMINE; BEARING;

D O I：

10.1007/s10965-013-0219-0

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Two functional diamines, octyl-4-(3,5-diaminobenzamido)benzoate (O8, containing phenyl rings) and 3,5-diamino-N-(2-octyl-1,3-dioxoisoindolin-5-yl)benzamide (D8, containing a phthalimide ring), were designed and successfully synthesized. Two kinds of PIs were obtained by copolymerizing 3,3'-dimethyl-4,4'-methylenediamine (DMMDA), 4,4'-oxydiphthalic anhydride (ODPA), and D8 or O8. All of the PIs possessed excellent solubility. The PI films exhibited high transmittance, and were able to align liquid crystals (LCs) vertically. In contrast to the PIs generated from O8 (PI-O8), PIs created from D8 (PI-D8) were able to align LCs vertically even after rubbing, and also exhibited better thermal stability. The temperature at which 5 % of the weight of PI-D8 was lost (T-5) was higher than that for PI-O8. The results showed that the introduction of imide groups to the side chain improved the thermal stability and rubbing resistance of PIs without sacrificing their solubility and transmittance.

引用

页数：12

共 38 条

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