A simple molecular theory of double reentrance exhibited by highly polar compounds
作者:
N.V. Madhusudana,
Jyotsna Rajan,
期刊:
Liquid Crystals
(Taylor Available online 1990)
卷期:
Volume 7,
issue 1
页码: 31-40
ISSN:0267-8292
年代: 1990
DOI:10.1080/02678299008029191
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We show by simple model calculations that dipole-induced dipole and interchain interactions lead to aparallelalignment of molecules with strong longitudinal dipoles for intermolecular separations below a certain value. On the other hand an antiparallel alignment is favoured for larger separations because of dipole-dipole interactions. We incorporate this change in the intermolecular configuration, which naturally leads to two ‘lengths’ in the problem, in developing a simple McMillan type molecular theory of the double reentrance phenomenon in which the following phase sequence is observed on cooling the sample: isotropic-nematic-smectic Ad-reentrant nematic-smectic A1. The calculated properties including the phase diagram are in broad agreement with experimental trends.
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