This paper deals with the synthesis of photocurable polysiloxanes bearing epoxy norbornene groups. Two reactive schemes were used. The first one was an hydrosilylation of 5-vinyl-2-norbornene on hydrogeno chlorosilane followed by a condensation with alpha,omega-dihydroxy polydimethylsiloxane and completed by an epoxydation. The second way was an hydrosilylation of polysiloxane bearing Si-H groups with 2,3-epoxy-5-vinyl norbornene previously prepared by selective epoxydation of 5-vinyl-2-norobornene. All the compounds were characterized by 2D NMR (H-1-H-1 and H-1-C-13), FTIR, etc., and the first results on cationic photopolymerization with triaryl sulfonium hexafluoroantimonate as initiator are reported. As the temperature increases, the yield passes through a maximum at about 50-60 degrees C. (C) 1997 Elsevier Science Ltd.
