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http://hdl.handle.net/1942/19864
Title: | Photoinduced Acrylate Polymerization: Unexpected Reduction in Chain Branching | Authors: | WENN, Benjamin REEKMANS, Gunter ADRIAENSENS, Peter JUNKERS, Tanja |
Issue Date: | 2015 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | 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. | Keywords: | acrylates; kinetics (polym.); midchain radicals; NMR spectroscopy; photopolymerizations | Document URI: | http://hdl.handle.net/1942/19864 | ISSN: | 1022-1336 | e-ISSN: | 1521-3927 | DOI: | 10.1002/marc.201500198 | ISI #: | 000359793200004 | Rights: | © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2016 |
Appears in Collections: | Research publications |
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