Surface modification of imide containing polymers II: Co-reactive groups

This paper describes basic studies of the surface modification of polyimide covered wires for insulation of electrical machines. By introduction of surface reactive groups mechanical interlocking during the curing step should improve the life cycle. Kinetic analysis of ring opening reactions by aminolysis of low molecular model compounds for polyimides proved fast modification reactions under mild conditions. The co-reactivity of various functional groups with unsaturated polyesterimide, acrylate and epoxy resins was investigated by DSC. Aminolytic treatment of Kapton® sheets was followed by ATR-IR. Mandrel bend test of agglutinations of unmodified and amine-treated Kapton® sheets with different resins proved successful bonding and significantly improved adhesion.