Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical
| Autor: | Gérald Lopez, Gerard Jacobs Puts, Philippus L. Crouse, Taizo Ono, Bruno Ameduri |
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| Přispěvatelé: | Universite de Pretoria (UP), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), National Institute of Advanced Industrial Science and Technology (AIST), non, Collaboration : Equipe de Bruno Ameduri |
| Rok vydání: | 2015 |
| Předmět: |
radical copolymerisation
persistent radical Chain propagation perfluoro-3-ethyl-2 General Chemical Engineering Radical General Chemistry Fluorine-19 NMR Vinyl ether chlorotrifluoroethylene chemistry.chemical_compound [CHIM.POLY]Chemical Sciences/Polymers Monomer chemistry molecular weights Polymer chemistry Copolymer medicine isobutyl vinyl ether Solubility Chlorotrifluoroethylene 4-dimethyl-3-pentyl radical medicine.drug |
| Zdroj: | RSC Advances RSC Advances, Royal Society of Chemistry, 2015, 5, pp.41544-41554. ⟨10.1039/C5RA05066A⟩ |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c5ra05066a |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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