Mechanical and Ballistic Properties of Composites of Polypyrrole-Coated S-2 Glass Fabrics

Report No. ARL-TR-2105
Authors: Spurgeon, William A.; Klinger, J. R.; Roylance, Margaret E.
Date/Pages: October 1999; 56 pages
Abstract: This report presents the results of mechanical and ballistic tests on polyester and polyurethane-based composites of polypyrrole-coated 5-2 glass fabrics. The fabrics were obtained from the Milliken Research Corporation, Spartanburg, SC. The data support the proposition that the glass fibers are, at most, slightly damaged by the coating process that requires an acidic solution of pH 1. The mechanical properties of the interface between the glass fibers and the matrix resin are weakened by the presence of the polypyrrole coating in the polyester resin composites. As a consequence, the tensile, compressive, flexure, and short-beam-shear strengths are all lower than comparable composites made with uncoated fabrics. The ballistic properties of the polypyrrole-coated-fabric polyester resin composites are as good or perhaps even slightly better, however, as a result of increased delamination. The tensile strengths of the polypyrrole- coated-fabric polyurethane composites were slightly higher than for similar composites made with uncoated fabrics, although the flexural modulus was not changed. The tensile strength of the polypyrrole-coated fabrics was also measured and found to be about 20% higher than comparable amino-silane-sized fabrics, apparently as a consequence of the increased lubricity of the polypyrrole-coated fibers.
Distribution: Approved for public release
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Last Update / Reviewed: October 1, 1999