Influence of high levels of water absorption on the resistivity and dielectric permittivity of epoxy composites

被引：45
作者：
Gonon, P
Hong, TP
Lesaint, O
Bourdelais, S
Debruyne, H
机构：
[1] CNRS, French Natl Ctr Sci Res, Electrostat & Mat Dielect Lab, F-38042 Grenoble, France
[2] Univ Grenoble 1, F-38042 Grenoble, France
[3] Elect France, R&D Dept, F-92141 Clamart, France
来源：
POLYMER TESTING | 2005年 / 24卷 / 06期
关键词：
dielectric properties; epoxy composites; humidity ageing;
D O I：
10.1016/j.polymertesting.2005.02.001
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We studied the effects of water absorption (up to 1 wt%) on the dielectric properties of mica/glass/epoxy laminated composites used for high-voltage insulation. The DC resistivity, the dielectric constant and the dielectric loss were studied in the 10(-2)-10(6) Hz range, as a function of water uptake. The dielectric characteristics are strongly affected by water ingress. Upon water sorption the resistivity decreases by several orders of magnitude. Its variation is well described by a percolation law. The low-frequency permittivity rises to very large values. The large increase in the permittivity is related to an electrode polarisation mechanism. (c) 2005 Elsevier Ltd. All rights reserved.
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收藏
页码：799 / 804
页数：6
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