Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/13147
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dc.contributor.authorVoll, Dominik-
dc.contributor.authorHufendiek, Andrea-
dc.contributor.authorJUNKERS, Tanja-
dc.contributor.authorBarner-Kowollik, Christopher-
dc.date.accessioned2012-02-15T08:52:16Z-
dc.date.available2012-02-15T08:52:16Z-
dc.date.issued2012-
dc.identifier.citationMACROMOLECULAR RAPID COMMUNICATIONS, 33(1), p. 47-53-
dc.identifier.issn1022-1336-
dc.identifier.urihttp://hdl.handle.net/1942/13147-
dc.description.abstractOnline 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.-
dc.description.sponsorshipC.B.-K. acknowledges financial support for the current project from the German Research Council (DFG) as well as from the Karlsruhe Institute of Technology (KIT) in the context of the Excellence Initiative for leading German universities and the Ministry for Science and Arts of the state of Baden-Wurttemberg. We thank Dr. Leonie Barner (Fraunhofer ICT) for help with the elemental analyses of the novel photoinitiators.-
dc.language.isoen-
dc.publisherWILEY-BLACKWELL-
dc.subject.otherPolymer Science; free-radical polymerization of methyl methacrylate; multiphotoinitiated pulsed laser polymerization; pulsed laser polymerization-online size-exclusion chromatography-electrospray ionization-mass spectrometry; quantifying initiator efficiencies; substituted benzoins-
dc.subject.otherfree-radical polymerization of methyl methacrylate; multiphotoinitiated pulsed laser polymerization; pulsed laser polymerization-online size-exclusion chromatography-electrospray ionization-mass spectrometry; quantifying initiator efficiencies; substituted benzoins-
dc.titleQuantifying Photoinitiation Efficiencies in a Multiphotoinitiated Free-Radical Polymerization-
dc.typeJournal Contribution-
dc.identifier.epage53-
dc.identifier.issue1-
dc.identifier.spage47-
dc.identifier.volume33-
local.format.pages7-
local.bibliographicCitation.jcatA1-
dc.description.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-
local.publisher.placeMALDEN-
local.type.refereedRefereed-
local.type.specifiedArticle-
dc.bibliographicCitation.oldjcatA1-
dc.identifier.doi10.1002/marc.201100655-
dc.identifier.isi000298744400006-
item.accessRightsRestricted Access-
item.fulltextWith Fulltext-
item.validationecoom 2013-
item.contributorVoll, Dominik-
item.contributorHufendiek, Andrea-
item.contributorJUNKERS, Tanja-
item.contributorBarner-Kowollik, Christopher-
item.fullcitationVoll, Dominik; Hufendiek, Andrea; JUNKERS, Tanja & Barner-Kowollik, Christopher (2012) Quantifying Photoinitiation Efficiencies in a Multiphotoinitiated Free-Radical Polymerization. In: MACROMOLECULAR RAPID COMMUNICATIONS, 33(1), p. 47-53.-
crisitem.journal.issn1022-1336-
crisitem.journal.eissn1521-3927-
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