Copolymerization of vinylidene fluoride and acrylic acid in supercritical carbon dioxide |
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| Authors: | Vanessa Firetto Onofrio Scialdone Giuseppe Silvestri Alberto Spinella Alessandro Galia |
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| Affiliation: | 1. Dipartimento di Ingegneria Chimica dei Processi e dei Materiali, Università di Palermo, Viale delle Scienze, Ed. 6, 90128 Palermo, Italy;2. Centro Grandi Apparecchiature, UniNetLab, Università di Palermo, Via F. Marini 14, 90128 Palermo, Italy |
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| Abstract: | The free‐radical copolymerization of vinylidene fluoride (VDF) and acrylic acid (AA) was carried out in supercritical carbon dioxide using both precipitation and dispersion techniques in the presence of an ammonium carboxylate perfluoropolyether compound. Formation of a copolymer was confirmed by variable contact time CP MAS NMR spectroscopy. Macromolecular matrices were significantly enriched in AA with respect to the initial feed composition and we found that the nonfluorinated monomer has a much higher reactivity ratio with respect to VDF. The cumulative concentration, crystallinity, and water affinity of the synthesized copolymers could be modified changing the initial feed composition, the density of the polymerization mixture, the specific interfacial area of the polymer phase, and the polymerization time. The solubility of the macromolecular product in water was greatly affected by its composition. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 109–121, 2010 |
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| Keywords: | acrylic acid copolymerization fluoropolymers free‐radical copolymerization membrane radical polymerization supercritical fluids vinylidene fluoride |
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