Infrared spectroscopic study of a phenyl benzoate side group—methacrylate main chain polymeric liquid crystal
作者:
E. Hild,
A. Kocot,
J.K. Vij,
R. Zentel,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 16,
issue 5
页码: 783-803
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408027850
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The temperature dependence of the infrared dichroism of a side chain polymeric liquid crystal was investigated for two homogeneously oriented samples, one aligned with a PVA coating and the other aligned by a magnetic field. From the apparent order parameters, it was found that the rotation of the mesogenic side group was restricted. Not only the rigid part of the side group, but also the alkyl chains were found to be partly ordered. Realignment of the side groups was observed in the case of the magnetically aligned sample at the smectic-nematic transition temperature. Unlike the other absorption bands, the C˭O bond vibration band shifted to higher wavenumbers with increasing temperature. This behaviour was explained by the influence of the neighbouring mesogenic groups on the conjugation existing between the π-electron cloud of the benzene rings and the π-electrons of the C˭O bond.
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