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Weight ratio of water to polymer content for PSS/PDADMA CoPEC treated with NaCl solutions of various concentration (◻). Inset (●) shows water content as a weight % of the CoPEC. The dashed line is the theoretical weight ratio that comes from hydrating the polyelectrolyte ion pairs only (6.9 H2O per polyelectrolyte ion pair and 5.6 H20 per counterion-compensated site). The difference between the experimental and the theoretical values is due to the presence of the pores.
