A NMR study of the hydration of sulfo and carboxyl groups in perfluorinated cation exchange membranes

作者:Shestakov S L*; Pavlov A A; Maksimychev A V; Chernyak A V; Volkov V I; Timofeev S V
来源:Russian Journal of Physical Chemistry B, 2010, 4(6): 1005-1013.
DOI:10.1134/S1990793110060199

摘要

The mobility of the polymer matrix and the structure of the hydration complex in the acid forms of perfluorinated ion exchange membranes MF-4SK and F-4KF depending on moisture content were studied by (1)H, (13)C, and (19)F solid-state high-resolution NMR. A correlation between an increase in mobility of separate polymer matrix segments under hydration conditions and their hydrophilic properties was observed. Carboxyl groups in F-4KF membranes were shown to exist as dimers C(OOH)(2)C, and the main hydrated complex form in MF-4SK membrane under low moisture content conditions was the hydroxonium ion H(5)O (2) (+) .

  • 出版日期2010-12

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