Abstract
Chemical interactions in the primed aluminium/adhesive interphase were examined using IR reflectance spectroscopy. For the case of epoxy primers and polyurethane adhesives, a new absorption was detected and was attributed to an isocyanate group, formed by reaction between the epoxide primer and the polyurethane adhesive. When polyurethane adhesive was applied on a polyurethane primer, such a primer-adhesive interaction was not noticed.
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