By Adi Eisenberg, Howard L. Yeager

content material: Thermodynamic reviews of the water-perfluorosulfonated polymer interactions : experimental effects / M. Escoubes and M. Pineri --
Cation alternate selectivity of a perfluorosulfonate polymer / Howard L. Yeager --
shipping houses of perfluorosulfonate polymer membranes / Howard L. Yeager --
Solubility parameter of perfluorosulfonated polymer / Richard S. Yeo --
Mechanical relaxations in perfluorosulfonate ionomer membranes / Thein Kyu and Adi Eisenberg --
Nuclear magnetic resonance reviews and the speculation of ion pairing in perfluorosulfonate ionomers / R.A. Komoroski and K.A. Mauritz --
Infrared spectra of perfluorosulfonated polymer and of water in perfluorosulfonated polymer / Michael Falk --
Mössbauer spectroscopy of perfluorosulfonated polymer membranes : constitution of the ionic part / B. Rodmacq, J.M.D. Coey, and M. Pineri --
Morphology of perfluorosulfonated membrane items : wide-angle and small-angle X-ray reports / T.D. Gierke, G.E. Munn, and F.C. Wilson --
constitution of sulfonated and carboxylated perfluorinated ionomer membranes : small-angle and wide-angle X-ray scattering and light-weight scattering / Takeji Hashimoto, Mineo Fujimura, and Hiromichi Kawai --
Neutron experiences of perfluorosulfonated polymer buildings / M. Pineri, R. Duplessix, and F. Volino --
The cluster-network version of ion clustering in perfluorosulfonated membranes / T.D. Gierke and W.Y. Hsu --
Electrosynthesis with perfluorinated ionomer membranes in chlor-alkali cells / Ronald L. Dotson and Kenneth E. Woodard --
Perfluorocarboxylic acid membrane and membrane chlor-alkali procedure built by means of Asahi Chemical / Maomi Seko, Shinsaku Ogawa, and Kyoji Kimoto --
Perfluorinated ion alternate membranes / Toshikatsu Sata and Yasuharu Onoue --
Perfluorocarboxylate polymer membranes / Hiroshi Ukihashi and Masaaki Yamabe --
purposes of perfluorosulfonated polymer membranes in gas cells, electrolyzers, and cargo leveling units / Richard S. Yeo --
normal purposes of perfluorinated ionomer membranes / Brian Kipling.

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The o u t s t a n d i n g c h e m i c a l s t a b i l i t y o f t h i s p e r f l u o r i n a t e d m a t e r i a l w o u l d be an a d v a n t a g e i n s i t u a t i o n s w h e r e n o r m a l i o n exchange r e s i n s may s u f f e r d e g r a d a t i o n , s u c h as i n t h e h a n d l i n g o f h i g h l y r a d i o a c t i v e solutions. A g r a n u l a r f o r m o f 1200 EW N a f i o n was p r e p a r e d by g r i n d i n g membrane s a m p l e s a t l i q u i d n i t r o g e n t e m p e r a t u r e s , w h i c h g e n e r a t e d a 40-60 mesh p r o d u c t ( 1 1 ) .

The d e n o m i n a t o r o f t h i s t e r m i s t h e r e f o r e t h e v o l u m e f r a c t i o n o f w a t e r i n t h e membrane, c a l c u l a t e d f r o m s o r p t i o n r e ­ sults. T h i s f u n c t i o n was d e v e l o p e d by Y a s u d a and c o - w o r k e r s t o t r e a t d i f f u s i o n i n v a r i o u s h y d r o p h i l i c polymers (12). ch004 + + + + + + + + p D = D° exp p [-b V / ( 1 - V p p p (1) d e s c r i b e s t h e r e l a t i o n s h i p b e t w e e n t h e aqueous and t h e p o l y m e r d i f f u s i o n c o e f f i c i e n t s o f a s p e c i e s , D° and D r e s p e c t i v e l y .

These i s o t h e r m s w e r e i n t e g r a t e d t o p r o d u c e o v e r a l l s e l e c tivity coefficients. 61. These v a l u e s a r e v e r y s i m i l a r t o t h o s e i n aqueous e n v i r o n m e n t s , w i t h t h e m i n o r e x c e p t i o n t h a t s o d i u m i o n i s now l e s s p r e f e r r e d t h a n h y d r o g e n i o n . It is i n t e r e s t i n g to note that Na e x c h a n g e i s now a c c o m p a n i e d by a s l i g h t i n c r e a s e i n s o l v e n t s o r p t i o n , w h i c h may a c c o u n t f o r t h i s d i f f e r e n c e i n t e r m s o f an e n t r o p y - d r i v e n p r o c e s s ( 1 0 ) .

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