Abstract: We studied an epoxy-acrylate hybrid UV-cure system and demonstrated that the diaryliodonium salt can be sensitized by the free radical photo-initiators. The cured product of hybrid UV-cure system has better mechanical properties, such as hardness, bending strength, impact strength, etc., than those of the cationic product. The glass transition temperature (T_g) of hybrid- cured product is higher than that of the free-radical product. The solvent-resistance (double acetone rubs) of hybrid UVcured product is much higher than those of either free-radical product or cationic product. The excellent performance was attributed to the formation of interpenetrating polymer network (IPN), which was demonstrated by dynamic viscoelastic spectra and scanning electron microscope (SEM).

Key words: Hybrid polymerization, UV-cure, Interpenetrating polymer network