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Perfluorinated Ionomer Membranes by Adi Eisenberg, Howard L. Yeager

By Adi Eisenberg, Howard L. Yeager

content material: Thermodynamic stories of the water-perfluorosulfonated polymer interactions : experimental effects / M. Escoubes and M. Pineri --
Cation alternate selectivity of a perfluorosulfonate polymer / Howard L. Yeager --
delivery homes 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 stories and the idea 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 experiences / 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 lightweight scattering / Takeji Hashimoto, Mineo Fujimura, and Hiromichi Kawai --
Neutron reports of perfluorosulfonated polymer constructions / 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 strategy constructed by means of Asahi Chemical / Maomi Seko, Shinsaku Ogawa, and Kyoji Kimoto --
Perfluorinated ion trade membranes / Toshikatsu Sata and Yasuharu Onoue --
Perfluorocarboxylate polymer membranes / Hiroshi Ukihashi and Masaaki Yamabe --
functions of perfluorosulfonated polymer membranes in gasoline cells, electrolyzers, and cargo leveling units / Richard S. Yeo --
basic purposes of perfluorinated ionomer membranes / Brian Kipling.

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The l o w e r s l o p e s f o r t h e e x p a n d e d f o r m a r e c o n s i s t e n t w i t h t h e e x p e c t a t i o n t h a t i o n c l u s t e r s w o u l d be more aqueous-like, y i e l d i n g s m a l l e r entropy increases per r e l e a s e d w a t e r m o l e c u l e , e v e n t h o u g h t h e amount o f w a t e r r e l e a s e d p e r e q u i v a l e n t o f e x c h a n g e d i o n s i s g e n e r a l l y l a r g e r compared t o t h e normal form. Thus i t a p p e a r s t h a t t h e l a r g e s p r e a d i n i o n e x c h a n g e s e l e c t i v i t i e s f o r a l k a l i m e t a l i o n exchange w i t h hydrogen i o n are c a u s e d by e n t r o p y i n c r e a s e s upon d e s o r p t i o n o f w a t e r f r o m N a f i o n .

P e r h a p s t h e most i n t e r e s t i n g f e a t u r e o f t h e s e v a l u e s i s t h e i r l a r g e s p r e a d compared t o c o n v e n t i o n a l sulfonate resins. 17 ( C s ) ( 1 2 ) . ch003 PERFLUORINATED IONOMER M E M B R A N E S Figure 1. 01 M strength (10, 11). Key: ·, L i + ; •, Na+; K+; A, Rb+; M, Cs+; © , T1+. 0 + Figure 2. 01 M ionic strength (10). Closed symbols: normal form; open symbols: expanded form of polymer. Symbols are the same as those in Figure 1. PERFLUORINATED IONOMER 30 MEMBRANES v a r i o u s c r o s s - l i n k i n g s though, which i n d i c a t e s t h a t f o r t h i s p e r f l u o r i n a t e d p o l y m e r w i t h no a r o m a t i c c o n t e n t , n o n e l e c t r o s t a t i c i n t e r a c t i o n s b e t w e e n c o u n t e r i o n s and t h e p o l y m e r m a t r i x a r e r e d u c e d t o a minimum.

YEAGER Cation Exchange Selectivity 39 The d y n a m i c c h a r a c t e r o f p o l y m e r s s u c h a s N a f i o n i n t e r m s o f s o l v e n t s w e l l i n g c a n h a v e a marked i n f l u e n c e o n t h e t h e r m o d y n a m i c s o f i o n exchange p r o c e s s e s . Literature Cited 1. 2. 3. ch003 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. Eisenman, G. Proc. 23rd Int. Congr. of Physiol. S c i . ; Exerpta Medica 1965, 87, 489-506. Richenberg, D.

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