Abstract
The triplet state of 2-piperidinoanthraquinone has been generated in toluene solutions using nanosecond laser flash photolysis. The effect of epoxy resin and polyamine hardener on the yield and lifetimes of the dye triplet state and the dye semiquinone species has been studied. For both resin and hardener, dye semiquinone species are produced which subsequently disproportionate to yield the hydroquinone and so cause photo-fading. The mechanisms by which these free radicals are formed and their relevance to the photo-fading of dyed epoxy resin are discussed in detail.
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