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Dielectric properties of copper powder-epoxy resin composites

Authors
Journal
European Polymer Journal
0014-3057
Publisher
Elsevier
Publication Date
Volume
24
Issue
7
Identifiers
DOI: 10.1016/0014-3057(88)90026-2

Abstract

Abstract The dielectric properties of copper powder-epoxy resin composites have been determined between 10 Hz and 800 kHz through measurements of the capacitance of a cell ending a coaxial waveguide in a short circuit. The copper concentration ranged from 0 to 70% by wt or 23.2% by vol. The study of the variations with the filler content of the real and complex relative permittivities ϵ′ r and ϵ″ r show that the two relaxation processes of Cole-Cole type operate in the 1 and 200 kHz regions, at least as long as the weight percentage does not exceed 50. Beyond this value, the circle arc which is observed at low frequency in the Argand diagrams, starts being distorted into exponential segments and, although the percolation threshold is never reached within the filler concentration range in this work, the dependence of ϵ′ r and ϵ″ r on the amount of copper at 10 and 50 Hz can be described according to an electrical percolation law.

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