THE EFFECT OF MOLECULAR ASSOCIATION AND TUBE DILATION ON THE ROTATIONAL VISCOSITY AND ROTATIONAL DIFFUSION IN NEMATIC LIQUID-CRYSTALS

被引:19
|
作者
RAVIOL, A [1 ]
STILLE, W [1 ]
STROBL, G [1 ]
机构
[1] UNIV FREIBURG,FAK PHYS,D-79104 FREIBURG,GERMANY
来源
JOURNAL OF CHEMICAL PHYSICS | 1995年 / 103卷 / 09期
关键词
D O I
10.1063/1.470057
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A combination of director reorientation experiments with dielectric relaxation spectroscopy was used to study the relation between the rotational viscosity gamma(1) and the rotational diffusion constants in nematic compounds with different association tendency. Increased values for gamma(1) were found for; compounds showing strong association. This is explained by increased rotational friction of the associates due to the necessary translational motion of the molecules within these groups. For nonassociating compounds, gamma(1), was found to be described quantitatively by Marrucci's theory, when, in addition, the tube dilation effect described by Doi for the rotational diffusion in an orientationally ordered environment is taken into account. (C) 1995 American Institute of Physics.
引用
收藏
页码:3788 / 3794
页数:7
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