Influence of the humidity of the surface electrical conductivity in an epoxy resin

Author

Bendaoud, Mohamed ; Bouchtout, N. ; Kaouah, F. ; Said, Hohamed

Author_Institution

Lab. des Dielectriques, Inst. de Phys., Algiers, Algeria

fYear

1990

fDate

3-6 Jun 1990

Firstpage

199

Lastpage

201

Abstract

Surface currents were measured with a comb-shaped electrode system deposited on the same side of the sample. The samples were prepared with a diglycidyl ether of bisphenol A resin (DGEBA) cured with isophorm diamine (IPD). The results obtained with dry samples have shown a transitory current essentially due to a dipolar mechanism and, after a time t_p, a permanent current of ionic origin. When the sample was kept in a humid atmosphere, the adsorbed water molecules, bonded to lateral groups in the epoxy resin, increased the duration and the intensity of the transitory currents. On the other hand, ions formed by the water of sorption induce an increase in the permanent current intensity

Keywords

electric current measurement; humidity; organic insulating materials; polymers; surface conductivity; adsorbed water molecules; bisphenol A resin; comb-shaped electrode system; diglycidyl ether; dipolar mechanism; epoxy resin; humidity; isophorm diamine; permanent current; permanent current intensity; surface currents; surface electrical conductivity; transitory current; Atmosphere; Atmospheric measurements; Conductivity; Epoxy resins; Humidity measurement; Hydrogen; Impurities; Polarization; Spectroscopy; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on

Conference_Location

Toronto, Ont.

ISSN

1089-084X

Type

conf

DOI

10.1109/ELINSL.1990.109740

Filename

109740