The radicals formed upon visible light irradiation of the photoinitiator 2-benzyl-2-dimethylamino- 40-morpholinobutyrophenone (Irgacure 369), 1, were investigated by means of EPR spectroscopy coupled with the spin trapping technique both in the absence and in the presence of a monomer. The results suggest a dual behavior of 1 that may act both as a Type I and a Type II photoinitiator. From experiments carried out in the presence of 2-ethoxythioxanthone (Pila 124), 2, an additive commonly used in combination with 1 as sensitizer, it is inferred that 2 mainly acts via hydrogen abstraction from 1. 2008 Elsevier Ltd. All rights
Further EPR-spin trapping studies of the photoinitiating activity of Irgacure 369
SCOPONI, Marco
2008
Abstract
The radicals formed upon visible light irradiation of the photoinitiator 2-benzyl-2-dimethylamino- 40-morpholinobutyrophenone (Irgacure 369), 1, were investigated by means of EPR spectroscopy coupled with the spin trapping technique both in the absence and in the presence of a monomer. The results suggest a dual behavior of 1 that may act both as a Type I and a Type II photoinitiator. From experiments carried out in the presence of 2-ethoxythioxanthone (Pila 124), 2, an additive commonly used in combination with 1 as sensitizer, it is inferred that 2 mainly acts via hydrogen abstraction from 1. 2008 Elsevier Ltd. All rightsFile in questo prodotto:
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