dc.contributor.author |
Puts, Gerard Jacob
|
|
dc.contributor.author |
Lopez, Gerald
|
|
dc.contributor.author |
Ono, Taizo
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|
dc.contributor.author |
Crouse, Philippus L.
|
|
dc.contributor.author |
Ameduri, Bruno M.
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|
dc.date.accessioned |
2015-06-25T08:41:38Z |
|
dc.date.available |
2015-06-25T08:41:38Z |
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dc.date.issued |
2015 |
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dc.description.abstract |
Results of the radical copolymerisation of chlorotrifluoroethylene (CTFE) with isobutyl vinyl ether (iBuVE) initiated by ∙CF3 radicals generated by β-scission of perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical (PPFR) at 90 °C in a batch reactor are reported. 19F NMR spectroscopy enabled the assessment of the molecular weights of the poly(CTFE-alt-iBuVE) copolymer by end-group analysis. It was found that, at low initiator concentrations (≤ 10 mol%), the ∙CF3 radicals preferably attack the vinyl ether monomer to initiate chain propagation and produce alternating poly(CTFE-alt-iBuVE) copolymers. At initiator ratios of 20 mol%, 19F NMR signals in the CF3 region other than the expected CH2-CF3 are observed and are attributed to ∙CF3 addition patterns due to kinetic effects brought on by monomer solubility. The molecular weights for the copolymer produced from 1%, 5%, and 10% PPFR were found to be 340 000, 237 000 and 122 000 g∙mol-1, respectively. The copolymer produced from 20% PPFR was oligomeric in nature with a molecular weight of 18 000 g∙mol-1. |
en_ZA |
dc.description.embargo |
2016-05-30 |
en_ZA |
dc.description.librarian |
hb2015 |
en_ZA |
dc.description.sponsorship |
National Research Foundation of South Africa, CNRS, France and the south African Department of Science and Technology’s Fluorochemical Expansion Initiative. |
en_ZA |
dc.description.uri |
http://www.rsc.orgadvances |
en_ZA |
dc.identifier.citation |
Puts, GJ, Lopez, G, Ono, T, Crouse, PL & Ameduri, BM 2015, 'Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical', RSC Advances, vol. 5, no. 52, pp. 41544-41554. |
en_ZA |
dc.identifier.issn |
2046-2069 |
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dc.identifier.other |
10.1039/C5RA05066A |
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dc.identifier.uri |
http://hdl.handle.net/2263/45779 |
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dc.language.iso |
en |
en_ZA |
dc.publisher |
Royal Society of Chemistry |
en_ZA |
dc.rights |
© The Royal Society of Chemistry 2015 |
en_ZA |
dc.subject |
Radical copolymerisation |
en_ZA |
dc.subject |
Batch reactor |
en_ZA |
dc.subject |
Molecular weights |
en_ZA |
dc.subject |
Chlorotrifluoroethylene (CTFE) |
en_ZA |
dc.subject |
Isobutyl vinyl ether (iBuVE) |
en_ZA |
dc.title |
Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical |
en_ZA |
dc.type |
Postprint Article |
en_ZA |