SYNTHESIS AND CHARACTERIZATION OF A NOVEL POLYMERIC SYSTEM BEARING A BENZOPHENONE BORATE SALT AS A NEW PHOTOINITIATOR FOR UV CURING

Polymeric photoinitiators bearing benzophenone triphenylbutyl berate s alt as the side chain have been synthesized and characterized and thei r activity measured in the photoinitiated polymerization of a bifuncti onal monomer, diethylene glycol diacrylate. The results were compared with a low-molecular weight model compound. At lower concentrations of the requisite benzophenone moiety, the highest activity was observed for the model compound, while at higher concentrations the homopolymer was superior. For both cases, the lowest photoinitiation activity was observed with significant induction period for copolymers with methyl methacrylate when compared to the homopolymer. The results are discus sed in light of the microenvironment of the initiator fragments in the polymeric systems.