Adhesion mechanism of polyvinyl chloride to silane primed metal surfaces

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Abstract
The interface of partially hydrolyzed organosilane primer Dow Corning® Z-6020 [N-(2-aminoethyl-3-aminopropyl trimethoxy silane], which will be referred to in this paper as simply AEAPS, and polyvinyl chloride (plastisol) was examined by XPS (X-ray photoelectron spectroscopy) depth profile analysis. These studies and the adhesion strength measurements under dry and wet conditions showed that the net bond strength and its resistance to moisture are determined by two factors: the extent of crosslinking of the primer and the interdiffusion of the two phases. Best adhesion is achieved as a result of the optimal balance between the above two conflicting tendencies, i.e. when the primer crosslinks after it has diffused into the polymer.