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

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

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- MECHANICAL PERTURBATION INDUCED MOLECULAR ALIGNMENTS IN A SIDE-CHAIN LIQUID CRYSTALLINE POLYACETYLENE, POLY{10-[4-(4'-METHOXYPHENOXY-CARBOML)PHENOXYCARBONYL]-1-DECYNE}*
- Vol. 17, Issue 3, Pages: 289-294(1999)
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- Published：20 June 1999
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MECHANICAL PERTURBATION INDUCED MOLECULAR ALIGNMENTS IN A SIDE-CHAIN LIQUID CRYSTALLINE POLYACETYLENE, POLY{10-[4-(4'-METHOXYPHENOXY-CARBOML)PHENOXYCARBONYL]-1-DECYNE}*[J]. 1999, 17(3): 289-294.
DOI：

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

摘要

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

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.

Abstract

A new liquid crystalline polyacetylene containing a phenyl benzoate mesogen (5) is synthesized

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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