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Trends in Photochemistry & Photobiology   Volumes    Volume 5 
Nanosecond laser spectroscopy of photosensitive systems for polymerisation reactions
D. Burget, J. P. Fouassier, V. Lemee
Pages: 63 - 77
Number of pages: 15
Trends in Photochemistry & Photobiology
Volume 5 

Copyright © 1999 Research Trends. All rights reserved

The photochemistry of three photoinitiators issued from the α-sulphonyl acetophenones family is presented. Their excited states have been studied using time-resolved laser spectroscopy. Thus, interactions with hydrogen donors, monomers and amines lead to bimolecular quenching which rate constants have been measured. The triplet state of one of the ketones studied presents a charge transfer character which confers it a peculiar behaviour in front of electron donors: the case of its behaviour with the amines is discussed. Part of the interactions with the olefins, the influence of the polymerisation inhibitor present in commercial monomers on the quenching rate constant observed with such mixtures has been quantified. Finally, the influence of the environment viscosity on the energy transfer has been determined.
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