Preparation of thin perfluorosulfonate cation-exchanger films by plasma polymerization

Journal Article · Thu Sep 01 04:00:00 EDT 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2055124· OSTI ID:6910762

Yasuda, Kazuaki; Uchimoto, Yoshiharu; Ogumi, Zempachi; Takehara, Zenichiro ^[1]

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1. Kyoto Univ. (Japan). Division of Energy and Hydrocarbon Chemistry

Perfluorinated, ultrathin polymer films containing sulfonic acid groups were prepared by plasma polymerization of trifluoromethanesulfonic acid and hexafluoropropylene. Electron spectroscopy for chemical analysis and Fourier transform infrared spectroscopy measurements indicated that the sulfonic acid groups were fixed to the backbone chain of the perfluorinated polymer. The structure of the plasma polymer was strongly dependent on the applied RF power. At high levels of applied RF power, the sulfonic acid groups of the starting material were easily decomposed during plasma polymerization. The perfluorinated cation-exchanger films prepared at low applied RF power were about 1[mu]m thick and free from pinholes. The films showed high cation permselectivity, as confirmed by a K[sup +] ion transference number of 0.99 in aqueous KCl solution.

• OSTI ID: 6910762
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:9; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

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