EFFECT OF MOLECULAR-WEIGHT AND ORIENTATION ON THE CONDUCTIVITY OF CONJUGATED POLYMERS

被引:59
作者
PEARSON, DS [1 ]
PINCUS, PA [1 ]
HEFFNER, GW [1 ]
DAHMAN, SJ [1 ]
机构
[1] UNIV CALIF SANTA BARBARA,DEPT MAT,SANTA BARBARA,CA 93106
关键词
D O I
10.1021/ma00059a013
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A method for calculating the effect of molecular weight and orientation on the conductivity of polymers has been developed. The conductivity in the isotropic state is found to depend on the charge carrier density, the polymers persistence length, the mean lifetime of the charge on a polymer, tau(c), and the time for a charge to diffuse the length of a single polymer, tau(i). We describe a method for estimating these time constants individually by a combination of ac and dc measurements. Our prediction for the enhancement of conductivity when the polymer is stretched is in good agreement with existing experimental data. We conclude with a discussion of how the macroscopic conductivity is affected by chain stiffness, by molecular weight distribution, and by defects that can block charge diffusion along a polymer chain.
引用
收藏
页码:1570 / 1575
页数:6
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