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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/13147

Title: Quantifying Photoinitiation Efficiencies in a Multiphotoinitiated Free-Radical Polymerization
Authors: Voll, Dominik
Hufendiek, Andrea
Barner-Kowollik, Christopher
Issue Date: 2012
Abstract: Online size exclusion chromatographyelectrospray ionizationmass spectrometry (SEC/ESIMS) is employed for quantifying the overall initiation efficiencies of photolytically generated radical fragments. In a unique experiment, we present the first quantitative and systematic study of methyl-substituted acetophenone-type photoinitiators being employed in a single cocktail to initiate the free-radical polymerization of methyl methacrylate (MMA) in bulk. The photoinitiators are constituted of a set of two known and four new molecules, which represent an increasing number of methyl substituents on their benzoyl fragment, that is, benzoin, 4-methylbenzoin, 2,4-dimethylbenzoin, 2,4,6-trimethylbenzoin, 2,3,5,6-tetramethylbenzoin, and 2,3,4,5,6-pentamethylbenzoin. The absolute quantitative evaluation of the mass spectra shows a clear difference in the initiation ability of the differently substituted benzoyl-type radical fragments: Increasing the number of methyl substituents leads to a decrease in incorporation of the radical fragments.
Notes: [Voll, Dominik; Hufendiek, Andrea; Barner-Kowollik, Christopher] Karlsruhe Inst Technol KIT, Inst Tech Chem & Polymerchemie, D-76128 Karlsruhe, Germany. [Junkers, Thomas] Univ Hasselt, Polymer React Design Grp, Inst Mat Res, BE-3590 Diepenbeek, Belgium. christopher.barner-kowollik@kit.edu
URI: http://hdl.handle.net/1942/13147
DOI: 10.1002/marc.201100655
ISI #: 000298744400006
ISSN: 1022-1336
Category: A1
Type: Journal Contribution
Validation: ecoom, 2013
Appears in Collections: Research publications

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