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