Shear alignment behavior of nematic solutions induced by ultralong side-group liquid crystal polymers

被引：12

作者：

Kempe, MD ^{[1
]}

Kornfield, JA ^{[1
]}

机构：

[1] CALTECH, Pasadena, CA 91125 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.90.115501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Addition of a low concentration of a very long (430 kg/mol) side group liquid crystal polymer is shown to produce dramatic changes in the flow characteristics of a calamitic nematic liquid crystal. This polymer causes a typical flow-aligning nematic liquid crystal to align near the velocity gradient direction rather than near the velocity direction, corresponding to having a tumbling parameter lambda < -1, for concentrations greater than 7.5% polymer. Such flow-aligning behavior has not been reported previously in a calamitic nematic. The large molecular weight of the present polymer relative to those examined in the prior literature is responsible for these new phenomena.

引用

页数：4

共 34 条

[31] Flow-aligning and tumbling in small-molecule liquid crystals: pure components and mixtures [J].