Influence of fluorination extent on liquid crystalline properties of semi-perfluorinated phenylpyrimidine ferroelectric liquid crystals
作者:
HONG LIU,
HIROYUKI NOHIRA,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 24,
issue 5
页码: 719-726
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998206830
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A series of semi-perfluorinated ferroelectric liquid crystals, 2-[4-(2-fluoro-octyloxy)phenyl]- 5-(omega-n-perfluoroalkylalkyloxy)pyrimidines were prepared and their physical properties evaluated. All of the fluorinated phenylpyrimidines exhibited a chiral smectic C phase enantiotropically. The results showed that high fluorination extent favours the tilted chiral smectic C phase. Also, highly fluorinated compounds exhibited a large cone tilt angle and large spontaneous polarization. However, the response became slow as the fluorination extent increased. Although the compounds showed a large spontaneous polarization in the pure state, their spontaneous polarization power as chiral dopants was so small that very little spontaneous polarization could be measured.
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