SYNTHESIS AND PROPERTIES OF LIQUID-CRYSTALLINE POLYACETYLENE DERIVATIVES

被引:73
作者
AKAGI, K
GOTO, H
KADOKURA, Y
SHIRAKAWA, H
OH, SY
ARAYA, K
机构
[1] SOGANG UNIV,DEPT CHEM ENGN,SEOUL 121742,SOUTH KOREA
[2] HITACHI LTD,ADV RES LAB,KOKUBUNJI,TOKYO 185,JAPAN
关键词
D O I
10.1016/0379-6779(94)02342-V
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have synthesized mono-substituted acetylenes with a liquid crystalline group and then polymerized them with Ziegler-Natta and metathesis catalysts. The liquid crystalline group in the side chain of the polymer is composed of a cyclohexylphenoxy (PCH) or biphenoxy (BP) moiety as a mesogenic core, a methylene chain [-(CH2)(3)-] as a spacer, and an alkyl chain as a terminal group, The polymers are abbreviated as PPCHn03A (n = 2, 3, 5 similar to 8) or PBP503A. All polymers exhibited a fan-shaped texture in the polarizing microscope that is characteristic to smectic liquid crystalline phase, consistent with DSC measurements. Spectroscopic characterizations were carried out by means of IR, W-VIS, H-1- and C-13-NMR, as well as evaluations of molecular weights by GPC and electrical conductivities upon iodine doping before and after magnetically forced alignment.
引用
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页码:13 / 16
页数:4
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