Features of the mechanism of liquid-crystalline ordering in thermotropic copolymers with various flexible spacers and highly asymmetric mesogenic fragments

被引：0
|
作者：
Volchek, BZ [1 ]
Purkina, AV [1 ]
Medvedeva, DA [1 ]
Shilov, SV [1 ]
机构：
[1] Russian Acad Sci, Inst Macromol Cpds, St Petersburg 199004, Russia
来源：
VYSOKOMOLEKULYARNYE SOEDINENIYA SERIYA A & SERIYA B | 2000年 / 42卷 / 02期
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中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Conformation, orientation, and thermodynamic characteristics of a series of random copolymers containing highly asymmetric mesogenic fragments and flexible spacers with various lengths and chemical structures were studied by methods of IR spectroscopy, X-ray diffraction, and calorimetry. The molecular ordering of a smectic type observed in the polymers studied is explained by complete of partial segregation of the mesogenic chain fragments without change in the conformations of flexible spacers characteristic of the corresponding homopolymers. The structural order of these copolymers in the liquid-crystalline state is similar to the order observed in rigid-chain thermotropic random polymers in the same state.
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页码：236 / 244
页数：9
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