The Studies On The Kinetics Of Cationic/Super Low Temperature Photopolymerization

Photopolymerization of multifunctional monomers or oligomers, also called photocuring, has become a well-accepted technology which has been found a large variety of industrial applications because of its unique advantages, such as efficient, enabling, economical, energy-saving, environmental friendly, etc. In this thesis, the development of photocuring has been reviewed briefly.In this thesis, two triarylsulfonium salts (UVI-6976 and UVI-6992) were chosen, and the kinetics of their photo-induced cationic polymerization were investigated by real-time infrared spectroscopy (RT-FTIR), in which four epoxides were employed as monomers. The kinetics results indicated the reactivity of UVI-6976 was higher than UVI-6992. The effect of the different concentrations of UVI-6976 on kinetics was investigated. The results indicated that when the concentration increased from 0.5wt% to 1.0wt%, the rate of polymerization and conversion increased dramatically, but further increase of the initiator concentration only caused small amount increase of conversion. The results also indicated that t_max was identical at different concentrations of UVI-6976. Dark reaction results indicated that there was strong post-curing process for the epoxide-based monomer. The reactivity of different epoxy monomers was compared. The results showed that the final conversion increased at following order K-126