Synthesis and photopolymerization kinetics of polymeric one-component type II photoinitiator containing benzophenone moiety and tertiary amine

A polymeric one-component type II photoinitiator (PDABPP) based on 4,4'-dihydroxybenzophenone (DHBP), acryloyl chloride, and piperazine was synthesized, and its structure was confirmed by GPC and H-1 NMR. The photopolymerization kinetics of the photoinitiator was studied by real-time infrared spectroscopy. It indicated that PDABPP was a more effective photoinitiator than that of benzophenone (BP)/triethylamine (TEA). The rate of polymerization and final conversion increased, and the induction period shortened with increase of PDABPP concentration, light intensity, and amine concentration. The kinetics of photopolymerization for tripropylene glycol diacrylate (TPGDA) incorporating PDABPP in the presence of different tertiary amines as the initiating system indicated that the PDABPP/TEA combination exhibited the highest polymerization rates among the PDABPP/amines combinations.