Dielectric relaxation in polyaniline-polyvinyl alcohol composites

被引：170

作者：

Dutta, P ^{[1
]}

Biswas, S ^{[1
]}

De, SK ^{[1
]}

机构：

[1] Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, W Bengal, India

来源：

MATERIALS RESEARCH BULLETIN | 2002年 / 37卷 / 01期

关键词：

polymers; composite; dielectric properties;

D O I：

10.1016/S0025-5408(01)00813-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dielectric relaxation spectroscopy of HCl-doped PANI-PVA composites have been investigated in the temperature range 110-300 K and in the frequency range 200 Hz-10 MHz near the percolation threshold. A large value of the dielectric constant has been observed at high temperature and low frequency. The complex dielectric constant epsilon*(omega) has been described by the electric modulus M*(omega) = (1/epsilon*(omega)) = M'(omega) + iM"(omega). The data of M*(omega) has been analysed by the stretched exponential decay of the electric field, phi(t) = exp - (t/tau(0))(beta), where 0 < beta less than or equal to 1. The temperature dependence of M'(omega) and M"(omega) obey a single master curve with beta = 0.79. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：193 / 200

页数：8

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