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

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....

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Bibliographic Details
Published in:Polymer testing 2005-09, Vol.24 (6), p.799-804
Main Authors: Gonon, P., Pham Hong, T., Lesaint, O., Bourdelais, S., Debruyne, H.
Format: Article
Language:English
Subjects:
Applied sciences
Dielectric properties
Electric power
Engineering Sciences
Epoxy composites
Exact sciences and technology
Forms of application and semi-finished materials
Humidity ageing
Laminates
Polymer industry, paints, wood
Technology of polymers
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Summary: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.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2005.02.001