Triphenylsulfonium hexafluorophosphate

Thermodynamic data of the epoxy polymerization with triphenylsulfonium salt photoinitiators can be obtained by differential scanning calorimetric measurements (DSC). Figure 6 shows the DSC diagram of the polymerization of Bisphenol-A di-glycidylether with triphenylsulfonium hexafluorophosphate, irradiation being carried... 

On the other hand, it has been reported that triarylsulfonium salts are very reactive photoinitiators for the ring opening of epoxy monomers 7J. It was also reported (49) that a coating composed of 4% by weight of triphenylsulfonium hexafluorophosphate in 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane carboxylate cured in 20 seconds exposure. 

The photoinitiation of polymerization of pentaerythritol tetraacrylate using phenyl-(p-anisyl)-iodonium triflate or triphenylsulfonium hexafluorophosphate, sensitized with either l,6-diphenyl-l,3,5-hexatriene or 1,3-diphenyl-2-pyrazoline, was illustrated by Smith [111b] in 1981. Under his conditions, direct photolysis of the onium initiators failed to initiate polymerization. Baumann and co-workers, however, found conditions for initiation of radical polymerization on direct irradiation of onium salts [18,122], consistent with the hypothesized generation of radicals capable of cage escape in direct photolysis. 

Triphenylsulfonium hexafluorophosphate dissociates by hydrogen abstraction from RH to produce Bronsted acid HPFg ... 

Synthesis. Diphenyliodonium hexafluorophosphate, Ph2lPF6, and triphenylsulfonium hexafluoroantimonate, PhaSSbFe, were synthesized using literature procedures (25). Tetra-n-butylammonium hexafluorophosphate, TBAPFe, was obtained by direct metathesis between tetra-n-butylammonium bromide (99%) and potassium hexafluorophosphate (tech.), KPFe. 

---