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Abstract
Mechanical and adhesive properties were evaluated for an elastomer-modified model epoxy system cured with varying amounts of dicyandiamide (Dicy). The modulus and bulk fracture toughness values were found to be independent of Dicy content, whereas the adhesive performance was shown to be greatly influenced. For increases in Dicy content, single lap shear (SLS) failure values increased, while quasi-static double cantilever beam (DCB) performance was decreased. These adhesion test results are discussed in a comparative fashion. Preliminary x-ray photoelectron spectroscopy (XPS) surface evaluations are presented to discuss the drastic changes in DCB performance. It is postulated that in these model adhesive systems the Dicy variations produce significant chemical changes only in the epoxy/steel interphase region.
