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Activity Coefficient of Polyelectrolytes in the Ternary System Water-Sodium Polyvinyl Sulfate-Sodium Chloride

Isopiestic vapor pressure measurements were carried out for the ternary system water-sodium polyvinyl sulfate-sodium chloride. The variation of the isopiestic ratio with the concentration fraction of an electrolyte component is as large as that for water-sodium polyacrylate-sodium chloride. The mean activity coefficients of sodium polyvinyl sulfate and sodium chloride were obtained. The activity coefficient of the polyelectrolyte increases with polymer concentration. It decreases with increasing simple electrolyte concentration and through a minimum increases. The activity coefficient of sodium chloride decreases with its own concentration, obeying the cube-root rule. The presence of the polyelectrolyte enlarges the range of fit of the rule. The activity coefficient of sodium chloride decreases at first with increasing polymer concentration and then increases when the simple electrolyte concentration is low, whereas it increases monotonously with polymer concentration for high simple electrolyte concentrations. These results are compared with those previously obtained for the sodium polyacrylate system.