Reversible addition−fragmentation chain transfer polymerization initiated with ultraviolet radiation

Quinn, John F., Barner, Leonie, Barner-Kowollik, Christopher, Rizzardo, Ezio, & Davis, Thomas P. (2002) Reversible addition−fragmentation chain transfer polymerization initiated with ultraviolet radiation. Macromolecules, 35(20), pp. 7620-7627.

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Abstract

Styrene was polymerized under a source of ultraviolet radiation in the presence of certain thiocarbonylthio compounds. Use of 1-phenylethyl phenyldithioacetate (1-PEPDTA) produced well-defined polymers with molecular weights close to those predicted from theory, up to conversions of 30%. The mechanism of polymerization was examined and shown to proceed via reversible addition-fragmentation chain transfer, as opposed to reversible termination with a thiocarbonylthiyl radical. UV-induced decomposition of the dithioester moiety in 1-PEPDTA and 1-phenylethyl dithiobenzoate (1-PEDB) mediated RAFT polymerizations was followed using UV/vis spectrophotometry, 1-PEPDTA decomposed much slower than 1-PEDB. Analysis of the decomposition products of 1-PEPDTA with gas chromatography/mass spectrometry was used to elucidate a possible mechanism for its degradation, suggesting that both 1-phenylethyl and benzyl radicals are decomposition products.

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ID Code: 97512
Item Type: Journal Article
Refereed: Yes
DOI: 10.1021/ma0204296
ISSN: 1520-5835
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2002 American Chemical Society
Deposited On: 21 Jul 2016 23:50
Last Modified: 28 Jul 2016 21:52

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