Liquid-Crystalline Polymorphism in a Class of Low Molar Mass Analogues of Mesogenic Polyesters
作者:
R. Centore,
A. Roviello,
A. Sirigu,
期刊:
Liquid Crystals
(Taylor Available online 1988)
卷期:
Volume 3,
issue 11
页码: 1525-1534
ISSN:0267-8292
年代: 1988
DOI:10.1080/02678298808086692
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Low molar mass analogues of liquid-crystalline polyesters were prepared in which two α-methylstilbene groups are joined through an alkyl spacer. Their mesogenic behaviour was investigated using differential scanning calorimetry, X-ray diffraction and optical microscopy. The experimental results show that the formation of smectic phases is favoured by increasing the length of the terminal chains and by decreasing the length of the flexible spacer. For a given flexible spacer, the melting point and the nematic-isotropic transition temperature are enhanced by decreasing the length of the terminal chains. The terminal chains seem to have no substantial effect on the large odd-even effect exhibited by the thermo-dynamic properties associated with the nematic-isotropic transition.
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