Direct observation of the main-chain conformation of a combined liquid-crystal polymer
作者:
L. Noirez,
H. Poths,
R. Zentel,
C. Strazielle,
期刊:
Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 18,
issue 1
页码: 123-127
ISSN:0267-8292
年代: 1995
DOI:10.1080/02678299508036601
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The conformation of the main-chain (backbone) of a combined main-chain/side-chain liquid crystalline polymer has been qualitatively determined by small angle neutron scattering in the oriented nematic, the smectic A and the smectic C phases. The polymer backbone presents only a weak anisotropy, of prolate shape, in the nematic and the smectic C phases. A stronger reorientation of the backbones in the direction of the applied magnetic field is measured for the SAphase. However, this anisotropy remains small compared to the stretching of a main-chain liquid crystal polymer and the smectic structure results apparently from side-chain ordering. On the other hand, hydrodynamic measurements show that the combined polymer, in solvent, is as flexible as a polystyrene chain. This result is compatible with an explanation for the weak observed anisotropy.
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