The kinetics of the photopolymerization of epoxy acrylate/TiO2 nanocomposites, with 2'2-dimethoxy-1 2-diphenylethan-1-one (Irgacure 651) or benzophenone/ W-methyl diethanolamine as photoinitiators, were studied by FTIR spectroscopy. It was found that nanocomposites had a decreasing photopolymerization rates in comparison with pure epoxy acrylate. The photopolymerization rate of the nanocomposite could also be influenced by initiator types, oxygen, film thickness, irradiation intensity, dispersing media of TiO2 slurry, and so forth. (c) 2006 Wiley Periodicals, Inc.