Synthesis and photopolymerization kinetics of benzophenone piperazine one-component initiator

A one-component type II photoinitiator (PDBP), based on 4-hydroxybenzophenone (HBP), acryloyl chloride, and piperazine, was synthesized and its structure was confirmed by H-1-NMR. The photopolymerization kinetics of the photoinitiator was studied by real-time Infrared spectroscopy (FT-IR). It indicated that PDBP was a more effective photoinitiator than that of BP/triethylamine (TEA). The rate of polymerization, final conversion increased and the induction period shortened with increase in PDBP concentration, light intensity, and amine concentration. The kinetics of photopolymerization for TPGDA incorporating PDBP in the presence of different tertiary amines as the initiating system indicated that the PDBP/TEA combination exhibited the highest polymerization rates among the PDBP/amine combinations. Copyright (c) 2007 John Wiley & Sons, Ltd.