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A textbook of inorganic chemistry vol.IX part II Iron and

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This enables the determination of a s e l f d i f f u s i o n c o e f f i c i e n t f o r a polymer phase o f u n i f o r m composition w i t h no g r a d i e n t s i n i o n o r w a t e r s o r p t i o n . I n a d d i t i o n , s e l f d i f f u s i o n c o e f f i c i e n t s a r e more s t r a i g h t f o r w a r d i n t h e i r i n t e r p r e t a t i o n compared t o t h o s e o f e l e c t r o l y t e f l u x e x p e r i m e n t s , w h e r e c a t i o n and a n i o n t r a n s p o r t r a t e s a r e c o u p l e d .

The u s e o f hydrogen i o n forms o f N a f i o n as " s u p e r a c i d " s o l i d c a t a l y s t s f o r v a r i o u s organic r e a c t i o n s i s a r e f l e c t i o n o f t h i s low charge density (21). Second, t h e l a c k o f f o r m a l c r o s s - l i n k s generates a dynamic morphology f o r N a f i o n , i n w h i c h t h e w a t e r c o n t e n t o f t h e p o l y m e r w o u l d depend t o a l a r g e r e x t e n t on t h e h y d r a t i o n c h a r a c t e r i s t i c s of the counterion.

Thus s e l e c t i v i t i e s f o r these i o n s are s i m i l a r to those of l i g h t l y cross-linked polystyrene sulfonate resins. A p p l i c a t i o n o f N a f i o n f o r I o n Exchange C h r o m a t o g r a p h y A l t h o u g h N a f i o n i s g e n e r a l l y c o n s i d e r e d f o r use o n l y as a membrane m a t e r i a l , i t s s e l e c t i v i t y p r o p e r t i e s s u g g e s t t h a t i t w o u l d be p o s s i b l e t o p e r f o r m c h r o m a t o g r a p h i c s e p a r a t i o n s o f i o n s u s i n g t h e p o l y m e r as a s t a t i o n a r y p h a s e .

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