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.
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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|Item Type:||Journal Article|
|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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