Separation of Filler Particles from the Matrix in a Particulate-Loaded Composite Subjected to Tensile Stress

Abstract

Abstract Simultaneous measurements of tensile stress, longitudinal strain, and transverse strain were obtained on particulate-filled composites. The matrix was a flexible epoxy polymer. Small glass spheres were used as filler in various volume ratios up to 0.35. The spheres were pretreated as follows: clean, coated with a parting agent, coated with either of two silane coupling agents. The volume-expansion behaviors of these four systems of composites showed differences attributed to matrix-filler separation and subsequent vacuole formation. Stress-strain behaviors were especially sensitive to this dewetting process. These two types of data, obtained simultaneously and considered together, thus provide valuable information about interface adhesion.