Synthesis and characterization of 4,4 '-diacryloyloxybenzophenone

A copolymerizable type II photoinitiator 4,4'-diacryloyloxybenzophenone (DABP) based on 4,4'-dihydroxybenzophenone (DHBP) and acryloyl chloride was synthesized, and its structure was confirmed by H-1 NMR and real-time infrared spectroscopy. UV-vis absorption spectroscopy of DABP exhibited red-shifted maximal absorption as compared with benzophenone (BP). The kinetics of photo polymerization was studied by real-time infrared spectroscopy. It showed that DABP was a more effective photoinitiator than benzophenone. When this photointiator and amine was used to efficiently initiate polymerization of acrylates and methacrylates, both rate of polymerization and final conversion increased and the induction period was shortened with increase of amine concentration, DABP concentration and light intensity. (C) 2008 Published by Elsevier B.V.