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|Title: ||Quantifying Photoinitiation Efficiencies in a Multiphotoinitiated Free-Radical Polymerization|
|Authors: ||Voll, Dominik|
|Issue Date: ||2012|
|Citation: ||MACROMOLECULAR RAPID COMMUNICATIONS, 33(1), p. 47-53|
|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.
|ISI #: ||000298744400006|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2013|
|Appears in Collections: ||Research publications|
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