U-Shaped dimeric liquid crystals derived from phthalic acid
作者:
G.S. ATTARD,
A.G. DOUGLASS,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 22,
issue 3
页码: 349-358
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997209423
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Details of the transitional properties of four homologous series of U-shaped liquid crystal materials, the benzene-1,2-di-(4-carboxyalkoxybenzylidene-4-n-alkylanilines), are presented. The spacers incorporate 3 to 6 methylene units, whilst terminal aliphatic chain lengths are varied from 1 to 12 units. Members of the two homologous series with an odd number of methylene units in the spacer form nematic and smectic phases as a function of terminal chain length. Materials with an even number of methylene units in the spacer are purely smectogenic, and in both series the first two homologues form only smectic B phases. For all four series the higher homologues show the phase sequence SF/I-SC-SA-I. X-ray diffraction studies have shown that these smectic phases are composed of molecules arranged in bilayers.
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