Synthesis of Silicon-Epoxy Monomers Bearing Methoxy-Substituted Benzyl Ether GROUPS as Highly Reactive Monomers for Cationic Photopolymerization

摘要

A series of novel cationically photopolymerizable silicone-epoxide monomers bearing substituted benzyl ether groups were prepared. Monomers with methoxy groups on the aromatic ring of the benzyl ether group we're synthesized by straightforward methods. Kinetic studies using real-time infrared spectroscopy of the cationic photopolymerizations of these novel monomers showed that those monomers with two methoxy groups exhibited elevated rates of photopolymerization. The acceleration effect was explained on the basis of synergistic effects of two mechanisms, namely, the normal ring opening polymerisation catalysed by Bronsted acid, and the radical induced cationic photopolymerization. Silicone-epoxide monomer with 2,5-Dimethoxybenzyl ether group exhibited the higher photopolymerization rate.