POLYMER-BOUND HYDROXAMIC DITHIOBENZOIC ANHYDRIDE - A NEW HETEROGENEOUS PHOTOINITIATOR

Poly(methylmethacrylate) resins crosslinked with divinyl benzene, ethy leneglycol dimethacrylate and N,N'-methylene-bis-acrylamide were funct ionalized to generate a photodissociable chromophore, S-benzoyl-o-dith iohydroxamate. These polymeric mixed anhydrides were found to be effic ient heterogeneous initiators in the light-induced polymerization of a crylic and vinyl monomers. On UV irradiation, both homopolymers and gr aft polymers were obtained. Polymerization of MMA was followed at vari ous time intervals and as a function of monomer and initiator concentr ations. On varying the initiator concentration, the rate of polymeriza tion passed through a maximum. (C) 1998 SCI.