Polymeric photoinitiators containing in-chain benzophenone and coinitiators amine: Effect of the structure of coinitiator amine on photopolymerization

Through introducing of benzophenone and different coinitiator amines, three kinds of polymeric photoinitiator, PBPB, PBPE and PBPP, were synthesized. The UV-vis spectra of these polymeric photoinitiators are similar to the parent benzophenone. The photopolymerization of two monomers, methyl methacrylate (MMA) and poly(propylene glycol) diacrylate (PPGDA), initiated by these three types of polymeric photoinitiators was studied by dilatometer and photo-DSC. The results show that the structure of coinitiator amine has important influence on photopolymerization and different photoinitiators exhibit different behavior towards different monomers: PBPP is the most efficient for MMA, and PBPE is the most efficient for PPGDA.