Conductometric Titration for the Prediction of Conductivity in Solutions with Polymeric Membranes

The analytical technique of conductometric titration is used to characterize polymeric materials. This technique allows obtaining the polymer dry weight capacity (DWC) and the extent of reaction and establishing the optimal number of water molecules per sulfonic groups. In this particular case the polymer material under study was Nafion 117. Two different reactions were made: Neutralization and exchange. Both of them allow obtaining the same result. Conductometric titrations could be considered as a good method to study the neutralization and exchange reactions for polymeric materials used in fuel cells or electrolyzers. The implementation of this analytical technique allows reducing operation time of those types of materials. The waiting time between determinations permits to say that the amount of reactant consumed and products obtained were the same after each addition of titrant.