MECHANICAL PERTURBATION INDUCED MOLECULAR ALIGNMENTS IN A SIDE-CHAIN LIQUID CRYSTALLINE POLYACETYLENE, POLY{10-[4-(4'-METHOXYPHENOXYCARBONYL)PHENOXYCARBONYL]-1-DECYNE}

• 来源期刊: 高分子科学（英文版）
• 年，卷（期）: 1999,（3）
• 页码范围: 289-294
• 页数: 6页
• 语种: 英文

摘要

A new liquid crystalline polyacetylene containing a phenyl benzoate mesogen (5) is synthesized,whose mesomorphic properties are found to be easily "tunable" by simple mechanical perturbation. The polymerization of 10-[4-(4'-methoxyphenoxycarbonyl)phenoxycarbonyl]-1-decyne (4) initiated by the WCl6-Ph4Sn/dioxane complex yields polymer 5 with a Mw of 28400. The molecular structure of 5 is characterized by NMR, IR, and UV spectroscopy and its liquid crystalline behavior is investigated by DSC,POM, and XRD analysis. Upon mechanical perturbation, 5 exhibits unusual agitation-induced high-strength disclinations, shear-induced inversion walls, and solidification-induced banded textures. Such phenomena have been observed in the main-chain liquid crystalline polymers with rigid backbones, but have seldom been reported for the side-chain liquid crystalline polymers with flexible backbones, suggesting that the rigid polyacetylene backbone of 5 plays a constructive role in inducing the novel molecular alignments.