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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2010

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Electrical properties of polymeric gradient materials based on epoxy resin filled with hard coal

Stabik J., Szczepanik M., Dybowska A., Suchoń Ł.

Journal of Achievements in Materials and Manufacturing Engineering

2010

Vol. 38, nr 1

56-63

Purpose: of this paper was to describe functionally the gradient polymeric materials and technology of the gradient production. The experimental part describes preparation of circular disc samples of polymeric gradient material by gravity casting method. Finally electrical surface resistance and surface resistivity was measured and analysed. Design/methodology/approach: Eight specimens were prepared using gravity casting method. Composites with epoxy resin as a matrix and with respectively 3, 6, 9 and 12%vol of two types of hard coal as a filler were cast. Surface resistivity was applied as a measure of electrical properties. The idea of the test was to define electrical resistivity in sequential layers with different content and type of conductive component (hard coal). First, specimen’s thickness was measured and electrical resistivity was tested. Next, outer layer was removed by grinding and electrical measurements performed. The procedure was repeated for all subsequent layers. In effect, dependence of surface resistivity on depth of the layer was determined. Findings: The experimental results demonstrated that addition of conductive filler (hard coal) to epoxy resin caused a change of surface resistivity of these materials. Hard coal together with epoxy resin formed gradient composite material with different filler content in subsequent layers. Research limitations/implications: Further investigations with higher hard coal content and/or with different matrix are needed. Originality/value: This paper is original because in the research programme electrical properties of new type of polymeric gradient composites were tested and presented in it.