SYNTHESIS AND CHARACTERIZATION OF NOVEL LIQUID-CRYSTALLINE POLYURETHANES

被引：8
|
作者：
CIDADE, MT
BORDADO, JCM
FIGUEIRINHAS, J
MARTINS, AF
机构：
[1] UNIV NOVA LISBOA,FAC CIENCIAS & TECNOL,DEPT CIENCIA MAT,P-2825 MONTE DE CAPARICA,PORTUGAL
[2] INIC,CTR FIS MAT CONDENSADA,P-1699 LISBON,PORTUGAL
来源：
LIQUID CRYSTALS | 1993年 / 13卷 / 02期
关键词：
D O I：
10.1080/02678299308026302
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Novel polyurethanes have been synthesized by the condensation of two rigid diols, biphenyl-4,4'-diol (BPH(4,4')D) and 4-hydroxyphenyl-4-hydroxybenzoate (4HPH4'HB), with the flexible hexamethylene diisocyanate (HDI). Their phase diagrams were established by means of differential scanning calorimetry, nuclear magnetic resonance and polarizing optical microscopy. Poly(4HPH4'HB/HDI) was found to display a nematic phase between 140 and 199-degrees-C; poly (BPH(4,4')D/HDI) also exhibits a mesomorphic phase, but so far the nature of this phase has not been established.
引用
收藏
页码：295 / 300
页数：6
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