DIELECTRIC SUSCEPTIBILITY MEASUREMENTS OF THE PRIMARY AND SECONDARY RELAXATION IN POLYBUTADIENE

被引:56
作者
DEEGAN, RD [1 ]
NAGEL, SR [1 ]
机构
[1] UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637
来源
PHYSICAL REVIEW B | 1995年 / 52卷 / 08期
关键词
D O I
10.1103/PhysRevB.52.5653
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present data on the dielectric relaxation in the random copolymer polybutadiene. There are two distinct peaks in the imaginary part of the dielectric susceptibility, one of which is attributable to an alpha relaxation and the other to a Johari-Goldstein beta relaxation. The bifurcation of these two relaxations explains the previously reported decoupling of microscopic and macroscopic time scales in polybutadiene. We show that the spectral shape of the Johari-Goldstein relaxation is consistent with a log-normal response function.
引用
收藏
页码:5653 / 5656
页数:4
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