Abstract
Abstract The coating of a plastic substrate (polycarbonate sheets) with different uv-curable system was investigated. Systems based on an epoxy-acrylate resin (bisphenol-A-diglycidyl-ether-diacrylate) or on bisphenol-A-diethoxy-diacrylate were used in the presence of different reactive diluents. Pull-off experiments indicated that the presence of a reactive diluent able to dissolve or swell the polycarbonate matrix increased the adhesion properties; poor adhesion values were obtained by using reactive diluents which did not dissolve the polymer. When vinyl-pyrrolidone (VP) was used asa reactive diluent, Fourier transform infra-red analysis indicated that the VP diffused ino the polycarbonate matrix. Dynamic mechanical thermal analyses performed on thin films of polycarbonate attributable to the two polymeric phases. In the presence of diluent, the tan regions attributable to the two polymeric phases. In the presence of VP diluent, the tan σ peak of the coating phase was broader, thus suggesting the presence of a transition layer between the two phases.
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