Comparative study of anchoring strengths for photo- and rubbing-aligned liquid crystals on photoisomerizable polyimide alignment films

被引：25

作者：

Chung, DH ^{[1
]}

Takezoe, H

Park, B

Jung, YY

Hwang, HK

Lee, S

Han, KJ

Jang, SH

Yokoyama, H

机构：

[1] Tokyo Inst Technol, Dept Organ & Polymer Mat, Meguro Ku, Tokyo 1528552, Japan

[2] Inst Adv Engn, Elect Mat Res Lab, Yongin, South Korea

[3] Electrotech Lab, Tsukuba, Ibaraki 3058568, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 2000年 / 39卷 / 3A期

关键词：

photoalignment; rubbing; anchoring energy; polyimide; azo; entropy effect; high-electric-field technique;

D O I：

10.1143/JJAP.39.1252

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The high-electric-field technique was used to measure the out-of-plane (polar) anchoring strength at the interface between a nematic liquid crystal, pentylcyanobiphenyl (5CB), and a photosensitive polyimide (PI) alignment layer possessing an azo group in the main chain. The anchoring energy of the photoaligned state was found to be rather strong, on the order of 0.1 mJ/m(2), being at least half of the anchoring energy on the rubbed surface of the same azo PI. The anchoring energy exhibited a conspicuous peak near the clearing temperature of 5CB, particularly in the photoaligned system, indicating a significant role of molecular motion in anchoring behavior.

引用

页码：1252 / 1253

页数：2