Study of macrophotoinitiator containing in-chain thioxanthone and coinitiator amines

Three kinds of macrophotoinitiator, PTXB, PTXE and PTXP, were synthesized by step-polymerization of thioxanthone and different amino monomers. The UV–vis spectra of PTXP, PTXE and PTXB are similar with slightly-shifted maximum absorption, and the fluorescence emission varies. The photopolymerization of three monomers with different functionality, methyl methacrylate (MMA), poly(propylene glycol) diacrylate (PPGDA) and trimethylolpropane triacrylate (TMPTA), initiated by these three types of macrophotoinitiators was studied through dilatometer and photo-DSC. The results show different photoinitiators behaviors towards monomers efficiently: PTXP is the most efficient for MMA, PTXE is the most efficient for PPGDA and PTXB is the most efficient for TMPTA. The efficiency of the photopolymerization is mainly effected by structure of amine in macrophotoinitiator.