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Issue 52, 2015
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Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical

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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.

Graphical abstract: Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical

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Publication details

The article was received on 22 Mar 2015, accepted on 29 Apr 2015 and first published on 29 Apr 2015


Article type: Paper
DOI: 10.1039/C5RA05066A
RSC Adv., 2015,5, 41544-41554

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    Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical

    G. Puts, G. Lopez, T. Ono, P. Crouse and B. Ameduri, RSC Adv., 2015, 5, 41544
    DOI: 10.1039/C5RA05066A

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