The cationic photoinitiator S,S-dialkyl-S-(3,5-dimethyl-4-hydroxyphenyl) sulfonium (called 4HPS simply) was synthesized in this article. The synthesis was proved successfully through FT-IR spectrum, 1H-NMR, and elemental analysis. The cure kinetics of photoinitiator/ ZH92-21 were studied through FT-IR spectrum combined with a high pressure mercury lamp. The concentrations of residual epoxy group, curing rate Rp and kinetics of polymerize termination were discussed. The results showed that the cure termination reaction of HPS photoinitiator/ZH92-21 was diradical-termination.
Crivello, J.V. and Ahn, J. (2003). Synthesis and Characterization of Second-Generation S,S-Dialkyl-S-(dimethylhydroxyphenyl)sulfonium Salt Photoinitiators, Polym. Sci. Part A: Polym. Chem., 41: 2556-2571.
2.
Decker, C. and Moussa, K. (1990). Kinetic Study of the Cationic Photopolymerization of Epoxy Monomers, J. Polym. Sci. Part A: Polym. Chem., 28: 3429-3443.
3.
Gaarcia, M.S.D. , Rodriguez, M.V.G. and Redondo , F.J.D., et al. ( 2003). Kinetic of Epoxy Resin Formation by High-performance Liquid Chromatography , Journal of Applied Polymer Science , 89: 497-504.
4.
George, G.A. , Cole-Clarke, P., St. John, N. and Friend, G. (1991). Real-time Monitoring of the Cure Reaction of a TGDDM/DDS Epoxy Resin Using Fiber Optic FT-IR, Journal of Applied Polymer Science, 42(3): 643-657.
5.
Crivello, J.V. and Lam, J.H.W. (1980). Photoinitiated Cationic Polymerization by Dialkyl-4-Hydroxyphenylsulfonium Salts, J. Polym. Sci. Polym. Chem. Ed., 18: 1021-1034.
6.
Crivello, J.V. and Ahn, J. (2003). Photoinduced and Thermal Induced Cationic Polymerization by S,S-Dialkyl-S-(3,5-dimethylhydroxyphenyl)sulfonium Salts, J. Polym. Sci. Part A: Polym. Chem., 41: 2570-2579.
