Abstract
Electrical conductivity and percolation concentrations of epoxy and polyurethane (PU) resins filled with Ag-coated particles and short fibers were studied in this paper. Percolation concentrations were determined to be as follows: 29 vol.% for epoxy/Ag-coated fibers and PU/Ag-coated particles and fibers and 28 vol.% for epoxy/Ag-coated particles. The highest values of electrical conductivity were found for PU/Ag-coated fibers. Impact strength of epoxy and polyurethane resins filled with silver-coated inorganic particles and fibers were investigated as well. The decrease in impact strength with an increase in filler content was observed in all cases. The highest values of impact strength were found for epoxy/silver-coated short fibers composites. The strength of adhesive joints to aluminum, formed using these composites was also determined. The decrease of strength of adhesive joint to aluminum with an increase in filler content was observed in all cases. The highest strength of adhesive joints was found for the adhesives based on epoxy/silver-coated fiber composites. If the filler content in epoxy and polyurethane composites attained cca 30 vol.%, the suitable antistatic properties were obtained. No significant difference between antistatic properties of epoxy and polyurethane composite adhesives was found.
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