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- W2149355189 abstract "Abstract The kinetics and mechanism of the photopolymerization of dimethacrylates using three‐component initiation systems consisting of camphorquinone (CQ), diphenyliodonium hexafluorophosphate (Ph 2 IPF 6 ), and either N,N ,3,5‐tetramethylaniline (TMA) or N,N ‐dimethylbenzylamine or triethylamine were studied by photo‐DSC and UV‐visible spectroscopy. The effect of monomer structure on the curing kinetics and photobleaching were also investigated. Photo‐DSC studies showed fivefold increases in polymerization rate when all three components were present and the kinetics followed the trend: CQ/amine/Ph 2 IPF 6 ≫ CQ/amine > CQ/Ph 2 IPF 6. . For both CQ/amine/Ph 2 IPF 6 and CQ/amine systems, the CQ was rapidly photobleached during the photo‐DSC timescale but for the systems without amine there was an induction stage before CQ photobleaching was evident. Studies of the effect of monomer type on the photobleaching rate show that the photobleaching behavior was independent of monomer structure. Three photoinitiation mechanisms have been proposed. The reaction mechanism of the CQ/amine/Ph 2 IPF 6 system involves the reduction of the excited CQ molecule by the amine to form ketyl and aminoalkyl radicals, followed by the irreversible oxidation of the amine, and to a lesser extent, the ketyl radical by the iodonium salt, to form an initiating radical. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011" @default.
- W2149355189 created "2016-06-24" @default.
- W2149355189 creator A5054709496 @default.
- W2149355189 creator A5068460115 @default.
- W2149355189 date "2011-09-20" @default.
- W2149355189 modified "2023-10-18" @default.
- W2149355189 title "Enhanced photopolymerization of dimethacrylates with ketones, amines, and iodonium salts: The CQ system" @default.
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- W2149355189 doi "https://doi.org/10.1002/pola.24964" @default.
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