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Influence of absorbed moisture on the dielectric properties of epoxy resins

By Stephen J. Dodd, Nikola M. Chalashkanov, Len A. Dissado and John C. Fothergill

Abstract

The dielectric response of two bisphenol-A epoxy resin systems Araldite CY1301 (Tg ~ 50°C) and Araldite CY1311 (Tg ~0°C) was studied at different levels of absorbed moisture. The dielectric measurements were carried out over the frequency range 1 mHz to 100 kHz and the results were characterised in terms of dc bulk electrical conduction and dielectric processes. The characteristic parameters (frequency and magnitude) of all processes have been found to be moisture dependent. In both resins above the glass transition temperature, absorbed moisture was found to be implicated in the formation of a bulk quasi-dc dielectric response consistent with cluster formation of the absorbed water molecules.Peer-reviewedPost-printConference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2010, 17-20 Oct. 2010, West Lafayette, I

Topics: Dielectric measurements, Dielectrics, Epoxy resins, Glass, Moisture, Permittivity, Temperature measurement
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Year: 2010
DOI identifier: 10.1109/CEIDP.2010.5723953
OAI identifier: oai:lra.le.ac.uk:2381/10060
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