Preliminary Communication : Generation of high pretilt angles of nematic liquid crystal (5CB) on rubbed organic solvent soluble polyimide surfaces with helical backbone structure and trifluoromethyl moieties
作者:
DAE-SHIK SEO,
MICHINORI NISHIKAWA,
SHUNSUKE KOBAYASHI,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 22,
issue 4
页码: 515-517
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997209243
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
High pretilt angles of nematic liquid crystals (NLC) have been successfully generated on rubbed organic solvent soluble polyimide (PI) surfaces with a helical backbone structure and trifluoromethyl moieties. We have found that the pretilt angle of in 4-n-penty-4-cyanobiphenyl (5CB) on rubbed PI surfaces with trifluoromethyl moieties attached to the lateral benzene rings is larger compared to that on rubbed PI surfaces with trifluoromethyl moieties attached to the polymer backbone. The observed pretilt angle of 5CB on unidirectionally rubbed PI surfaces with trifluoromethyl moieties attached to the lateral benzene rings is about 15 degrees in the wide rubbing region. From these results, it is expected that the microscopic surface structure of the polymer strongly contributes to the pretilt angle generation of the LCs at the surface.
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