OBSERVATION OF HAIRPIN DEFECTS IN A NEMATIC MAIN-CHAIN POLYESTER

被引：72

作者：

LI, MH ^{[1
]}

BRULET, A ^{[1
]}

DAVIDSON, P ^{[1
]}

KELLER, P ^{[1
]}

COTTON, JP ^{[1
]}

机构：

[1] UNIV PARIS 11,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.70.2297

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The conformation of a main-chain liquid crystalline polyester in its oriented nematic phase has been determined by small-angle neutron scattering. The data are fitted by a model of rigid cylinder with orientational fluctuations. For a low degree of polymerization (approximately 9) the chain is almost completely elongated in the direction of the nematic field. For a polymer 3 times longer, the existence of two hair-pins is shown at high temperature; this number decreases with decreasing temperature.

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页码：2297 / 2300

页数：4

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