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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19864

Title: Photoinduced Acrylate Polymerization: Unexpected Reduction in Chain Branching
Authors: Wenn, Benjamin
Reekmans, Gunter
Adriaensens, Peter
Junkers, Thomas
Issue Date: 2015
Citation: MACROMOLECULAR RAPID COMMUNICATIONS, 36 (16), p. 1479-1485
Abstract: The branching stemming from midchain radical formation in n-butyl acrylate polymerization is investigated via melt-state C-13 NMR measurements. The dependence of the degree of branching (DB) on the monomer conversion of the system is examined for photoinduced polymerizations, revealing a steady increase in branching with conversion. For polymerization at moderate light intensities, an increase in branching from 0.03% to 0.37% is observed for polymerizations at 60 degrees C, which is fivefold below the level of branching observed in thermally initiated polymerizations under otherwise identical reaction conditions. The reason for this overall reduction in branching remains momentarily unclear; yet, a strong dependence of branching on light intensity is observed. While polymerization under a 1 W LED lamp results at almost full monomer conversion in branching degrees of 0.22%, polymerization under a 400 W lamp yields 1.81% of chain branches.
Notes: [Wenn, Benjamin; Junkers, Thomas] Univ Hasselt, Inst Mat Res IMO, Polymer React Design Grp, B-3590 Diepenbeek, Belgium. [Reekmans, Gunter; Adriaensens, Peter] Univ Hasselt, Inst Mat Res IMO, Nucl Magnet Resonance Spect Grp, B-3590 Diepenbeek, Belgium. [Adriaensens, Peter; Junkers, Thomas] IMEC, Associated Lab IMOMEC, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/19864
DOI: 10.1002/marc.201500198
ISI #: 000359793200004
ISSN: 1022-1336
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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