Synthesis of Ferroelectric Liquid Crystalline Polyoxiranes and Polyoxetanes by Ring Opening Polymerization
作者:
Chin-Shu Hsu,
Wei-Lung Liau,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 318,
issue 1
页码: 1-18
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808045372
出版商: Taylor & Francis Group
关键词: ferroelectric liquid crystalline polymers;polyoxirane;polyoxetane
数据来源: Taylor
摘要:
The synthesis of two series of liquid crystalline polyoxiranes and polyoxetanes containing 4-(4-hydroxybiphenyl-4′-carbonyloxy)- phenyl (2S,3S)-2-chloro-3-methylvalerate side groups is presented. Differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction measurements reveal liquid crystalline phases for all obtained polymers. A majority of the prepared polyoxiranes present cholesteric, smectic A, chiral smectic C and an undefined smectic phases. Most of the prepared polyoxetanes reveal only a chiral smectic C phase. Effect of polymer backbone and spacer length on the mesomorphic properties of the obtained polymers is discussed. Although the polyoxirane and polyoxetane backbone are more flexible than the polymethacrylate backbone, side-chain crystalization does not occur in any of the synthesized polymers.
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