Epoxy Resin Wetting of E Glass Single Filaments as it Relates to Shear Strength

The work of adhesion, W, of epoxy resin, water, and methylene iodide on sin e E-glass filaments was measured using a modified Wilhelmy apparatus. The resin used was a bisphenol A epoxy resin, and the fibers were coated with differing concentrations of silanes. Shear strengths were measured usint a single filament adhesion test. It was found that increasing W_a of resin on the fibers correlates with increasing shear strength of dry and water-boiled composites. This result and the results of methylene iodine and water wetting are analyzed in terms of the geometric mean approximation for the work of adhesion, and good agreement is found.