Photocross-linking of polymers initiated by benzylsulphonium salts as cationic initiators: Part II Poly(1,3-dioxolane-4-methyl methacrylate) and copolymers with methyl methacrylate

Photocross-linking of poly(1,3-dioxolane-4-methyl methacrylate) and copolymers with methyl methacrylate initiated by benzylsulphonium salt (BSS) has been explored. On photoirradiation, BSS directly produces benzyl cations which are capable of initiating cationic polymerization of side-chain cyclic ketals. The homopolymer and the copolymers were doped with BSS in the concentration range 0.05-5 mol% on the basis of the ketal units and the resulting films were irradiated at >300 nm in air