Abstract
AbstractThe effect of addition of isocyanate to a polyurethane adhesive has been investigated. Polyurethane adhesive was used for bonding a thermoplastic (TR) and a vulcanized (VR) synthetic butadiene‐styrene rubber. CO2 plasma treatment has oxidized the rubber surfaces, increasing surface energy (wettability), roughness, and favoring mechanical interlocking of rubber surface with the adhesive. Adhesion of TR rubber towards PU polyurethane adhesive was enhanced by these mechanisms; however, migration of antiadherent low molecular weight moieties to the VR rubber/polyurethane adhesive interface produced a lack of adhesion. In this case, it was necessary to produce the crosslinking with isocyanate of the polyurethane adhesive and of the VR rubber surface.magnified image
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