Molecular dynamics of a smectic liquid-crystalline side-chain polymer in its unaligned and aligned states as studied by dielectric relaxation spectroscopy
作者:
GeorgeS. Attard,
Graham Williams,
期刊:
Liquid Crystals
(Taylor Available online 1986)
卷期:
Volume 1,
issue 3
页码: 253-269
ISSN:0267-8292
年代: 1986
DOI:10.1080/02678298608086513
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Dielectric relaxation data are presented for unaligned, partially aligned and aligned thin films of a smectic liquid-crystalline side-chain polymer in the ranges 12 to 105Hz and 299 to 343 K. The unaligned material exhibits a complicated dielectric absorption which has been resolved into two broad components (δ and α processes). The dielectric absorption changes remarkably on alignment of the material such that the δ process is enhanced by a factor of three and the α process is considerably diminished. A consideration is given of the molecular theory for dielectric relaxation in these materials and the variation in dielectric properties is shown to depend on the dipole components μml∥ and μml⊢, the order parameterSfor the mesogenic head groups and the order parameterSdfor the director alignment.
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