Chlor-alkali membrane is made from perfluorosulfonic acid and perfluorocarboxylic acid ion exchange resin. It has excellent ion conductivity and good capacity of ion exchange.
The anode side is sulfonate layer which is made from sulfonic acid resin that has good hydrophilicity. And it has higher moisture content than the carboxylate layer. The higher moisture content can increase the capacity of ion exchange that decide conductivity of membrane. So the sulfonate layer can be thick to ensure good conductivity and mechanical strength.
The cathode side is carboxylate layer that can well block the OH- from penetrating into the anode under the action of electric field. And it has high resistance which affects the efficiency of electric current, so this layer can be thin to reduce the membrane voltage.
The reinforcement can increase the strength of membrane and fix its geometric dimensions.
There are two affected factors on the use efficiency of chlor-alkali membrane:
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