ENTHALPIES OF DILUTION OF POLYELECTROLYTE SOLUTIONS AND EXCHANGE ENTHALPIES OF POLYELECTROLYTE COUNTERIONS

Experimental data of the enthalpies of dilution of aqueous polyelectro lyte solutions with water are presented, as well as the exchange entha lpies of polyelectrolyte counterions. Measurements were performed usin g a titration calorimeter. The procedure of obtaining exchange enthalp ies is described. The knowledge of these exchange enthalpies reveals i nformation about the enthalpies of formation of (polycation-polyanion) complexes which are the basic materials for the preparation of pervap oration membranes. The data obtained are also of interest for paper ma nufacturing industries because they provide a model of the interaction energies of polyelectrolytes with multiple-charged electrolytes, e.g. lignin sulfonate.