Viscoelasticity of dilute solutions of semiflexible polymers

被引：0
|
作者：
Pasquali, M [1 ]
Shankar, V [1 ]
Morse, DC [1 ]
机构：
[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
来源：
PHYSICAL REVIEW E | 2001年 / 64卷 / 02期
关键词：
D O I：
暂无
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
We show using Brownian dynamics simulations and theory how the shear relaxation modulus G(t) of dilute solutions of relatively stiff semiflexible polymers differs qualitatively from that of rigid rods. For chains shorter than their persistence length, G(t) exhibits three time regimes: At very early times, when the longitudinal deformation is affine, G(t)similar tot(-3/4). Over a broad intermediate regime, during which the chain length relaxes, G(t) similar to t(-5/4). At long times, G(t) mimics that of rigid rods. A model of the polymer as an effectively extensible rod with a frequency dependent elastic modulus B(omega)similar to (i omega)(3/4) quantitatively describes G(t) throughout the first two regimes.
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页数：4
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