Liquid crystalline phase transitions of the 2-(4-alkoxybiphenyl-4-yl)-5-(4-methylphenyl)pyridines
作者:
TETSUYA ASANO,
KEIICHI MORIYA,
SHINICHI YANO,
SHINGO TAKATANI,
SHINZO KAGABU,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 25,
issue 2
页码: 263-266
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998206416
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The mesomorphic phase transitions have been studied for a series of 2-(4-alkoxybiphenyl-4-yl)5-(4-methylphenyl)pyridines (4R-Pn; the carbon number, n, of the alkoxy group is 1-10) by use of DSC and polarizing optical microscopy. The 4R-Pn compounds showed only a nematic phase for n=1 and 2, but underwent characteristic polymesomorphic sequences when n>3; Cr CrH SmF SmC SmA N I with n=3 and 4, and Cr CrH SmF SmA N I with n=5-10. This mesomorphic phase transition behaviour was similar to that of the 2-(4-alkoxyphenyl)-5-(4-methylphenyl)pyridine (3R-Pn) series reported previously and it is proposed that the 4R-Pn and 3R-Pn compounds have a minimum terminal alkoxy length (critical alkoxy length) for the generation of LC polymorphism.
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