LIQUID-CRYSTALLINE PHOSPHAZENES BEARING BIPHENYL MESOGENIC GROUPS

被引：70
|
作者：
ALLCOCK, HR
KIM, C
机构：
[1] Department of Chemistry, The Pennsylvania State University
来源：
MACROMOLECULES | 1990年 / 23卷 / 17期
关键词：
D O I：
10.1021/ma00219a003
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
New thermotropic liquid crystalline phosphazene cyclic trimers and high polymers have been prepared by the incorporation of biphenyl derivative units connected to the skeleton by oligomeric ethyl- eneoxy spacer units. The cyclic trimer [NP|0(CH2CH2O)2C6H4C6H4CN}2]3 showed monotropic nematic schlieren texture between 102 and 59 °C. The phosphazene cyclic trimers and high polymers [NP{O-(CH2CH2O)3C6H4C6H4R}2]3 andn, where R = OMe, OEt, OPr-n, OPr-i, and OBu-n, have been synthesized. None of these cyclic trimers were liquid crystalline, but all the polymers showed enantiotropic liquid crystallinity. © 1990, American Chemical Society. All rights reserved.
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页码：3881 / 3887
页数：7
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