Linear viscoelasticity and director dynamics of nematic liquid crystalline polymer melts

被引:12
|
作者
Long, D [1 ]
Morse, DC [1 ]
机构
[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
来源
EUROPHYSICS LETTERS | 2000年 / 49卷 / 02期
关键词
D O I
10.1209/epl/i2000-00142-5
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We describe the linear viscoelastic response of monodomains of unentangled nematic liquid crystalline polymers, using a generalized Rouse model. We calculate the dynamic relaxation functions analogous to the Leslie viscosities. As a consequence of the coupling of the macroscopic director orientation n to Rouse relaxation of the chain conformations, we predict: 1) a non-monotonic evolution of the director orientation after a step deformation and continuous tumbling in steady shear for extended chains (with no hairpins), and flow alignment of anisotropic Gaussian chains (with many hairpins), and 2) a phenomenon of "director recoil" in the response of n to a transient magnetic field.
引用
收藏
页码:255 / 261
页数:7
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