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Proteins at Low Temperatures by Owen (editor) Fennema

By Owen (editor) Fennema

Washington 1979 1st American Chemical Society. ISBN 0-8412-0484-5. Advances in Chemistry sequence one hundred eighty. Hardcover. eightvo, 233pp., published fabric. establishment stamps on fore-edges, label at heel of backbone, one marginal inner stamp. stable, no DJ.

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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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