Perfluorinated ionomer solution processing

Industrial applications of perfluorinated ionomer membranes such as the electrolysis of sodium chloride solution to produce chlorine and sodium hydroxide often involve the use of highly concentrated solutions at elevated temperatures. The optimization of these systems depends upon a sound characterization of membrane transport processes under such conditions. Sodium ion is the major current-carrying species through the membrane in a chlor-alkali cell, and... 

The very high values of t ja+ (approaching 0.98 under certain conditions) and its variation with changes in cell parameters are subjects of great theoretical and practical interest. It should be noted that the lack of hydroxide ion migration through the membrane is not due to a Donnan exclusion process considerable sorption of NaOH is found in these perfluorinated ionomer membranes when they are exposed to caustic solutions (5). 

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