Citation: . MECHANICAL PERTURBATION INDUCED MOLECULAR ALIGNMENTS IN A SIDE-CHAIN LIQUID CRYSTALLINE POLYACETYLENE, POLY{10-[4-(4'-METHOXYPHENOXY-CARBOML)PHENOXYCARBONYL]-1-DECYNE}*[J]. Chinese Journal of Polymer Science, ;1999, 17(3): 289-294. shu

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

Received Date: 28 April 1998

A new liquid crystalline polyacetylene containing a phenyl benzoate mesogen (5) is synthesized,whose mesomorphic properties are found to be easily "tunab1e" by simple mechanical perturbation. Thepolymerization of 10- [ 4 - (4' -methoxyphenoxycarbonyl )phenoxycarbonyl] - 1 -decyne (4 ) in itiated by theWCl6-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.
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