Pretilt angles of liquid crystals in contact with rubbed polyimide films with different chain inclinations

被引：14

作者：

Arafune, R

Sakamoto, K

Yamakawa, D

Ushioda, S

机构：

[1] Res. Inst. of Elec. Communication, Tohoku University, Sendai 980-77, 2-1-1 Katahira, Aoba-ku

来源：

SURFACE SCIENCE | 1996年 / 368卷

关键词：

amorphous surfaces; infrared absorption spectroscopy; insulating films; polyimide-liquid crystal contact;

D O I：

10.1016/S0039-6028(96)01053-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have measured the pretilt angles of liquid crystals in contact with rubbed polyimide films (poly [4,4'-oxydiphenylene-pyromellitimide]; PMDA-ODA) that have different inclination angles of the polyimide chain. To produce polyimide films with different chain inclination angles, one film was rubbed in one direction only and the other film was rubbed twice in opposite directions. The average orientation of the polyimide chain was determined by polarized infrared absorption. The pretilt angle of the liquid crystal was measured by an improved crystal rotation method. We found that the pretilt angle increases with the increase of the inclination angle of the polyimide chain. This result indicates that the pretilt angle is mainly determined by the inclination angle of the polyimide chain in the film in contact.

引用

页码：208 / 212

页数：5

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