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The activity of 10 water soluble photoinitiators derived from thioxanthone, benzophenone, and benzil were studied comparatively. The mechanisms of initiation were determined by time resolved laser spectroscopy and steady state polymerization. The characteristic features of each series of compounds are pointed out. The possible contribution of biphotonic processes to the initiation step is considered.
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Lougnot et al. (1988) studied this question.
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