The reactivity in the excited state of new radical photoinitiators, S-phenyl thiobenzoates, was investigated. Laser flash photolysis experiments on various substituted compounds allowed both thiyl and benzoyl radicals to be observed. These two radicals arose from the or-cleavage of the C-S bond in the first excited triplet state. The ability to initiate radical polymerization was followed by dilatometry. From the results, it is found that the S-phenyl thiobenzoate photoinitiators can be even more reactive than benzoin ethers because of their better u.v. light absorption.
Посилання на статтю:
Reactivity of substituted S-phenyl thiobenzoates as photoinitiators of radical polymerization / F. Morlet-Savary and J. P. Fouassier and H. Tomioka // Polymer. – 1992. – Vol 33. – P. 4202-4206.