Abstract
The initiation efficiencies of 2-acetoxy thioxanthone and its methyl derivatives (in the 1, 3 and 4 positions) were studied by photocalorimetry when they were used as photoinitiators in the polymerization of butyl acrylate in bulk. The behaviour of the excited states of these new thioxanthones has been studied by spectroscopic measurements. As initiation results from the interaction of the thioxanthone molecule with tertiary amines, their photoreduction in the presence of a tertiary amine 2- N,N-diethylamino ethanol has also been investigated. Generally, most of the compounds exhibit high phosphorescence and triplet lifetimes at 77 K in addition to high photopolymerization efficiencies except 1-substituted derivatives where intramolecular hydrogen bonding is involved which enhances the rate of radiationless conversions.
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Schedule a callMore From: Journal of Photochemistry and Photobiology A: Chemistry
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