EFFECT OF PRESSURE ON THE DIELECTRIC-RELAXATION BEHAVIOR OF A LIQUID-CRYSTALLINE SIDE-CHAIN POLYMER

被引：18
|
作者：
MOURARAMOS, JJ
WILLIAMS, G
机构：
[1] UNIV COLL SWANSEA,DEPT CHEM,SINGLETON PK,SWANSEA SA2 8PP,W GLAM,WALES
[2] INST SUPER TECN,COMPLEXO INTERDISCIPLINAR,CTR QUIM FIS MOLEC,P-1000 LISBON,PORTUGAL
来源：
POLYMER | 1991年 / 32卷 / 05期
关键词：
DIELECTRIC PROPERTIES; LIQUID CRYSTALLINE POLYMER; PRESSURE EFFECTS;
D O I：
10.1016/0032-3861(91)90519-O
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The dielectric properties of a siloxane liquid crystal polymer have been studied over a range of frequencies (10-10(5) Hz), temperatures (50-75-degrees-C) and applied hydrostatic pressures (up to 1.5 kbar). The relaxation is due to the anisotropic motions of the dipolar mesogenic groups and its rate is strongly dependent upon the sample temperature and applied pressure. The sigma- and alpha-relaxations are observed and are assigned to specific modes of motion of the dipolar groups, and their behaviour, with respect to temperature and pressure variations, are compared and contrasted with the relaxation of chain segments in amorphous solid polymers.
引用
收藏
页码：909 / 915
页数：7
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