Abstract
The selective uptake of potassium ions versus tetramethylethyl-, ethyl-,and propylammonium ions by fully neutralized, crosslinked polymethacrylate gels was measured in aqueous, mixed aqueous, and nonaqueous solvents. Swelling pressures in water were calculated from isopiestic data, so the Coulombic contribution to the total free energy of the exchange process could be calculated and compared with theory. A good fit between experiment and theory was possible only by assigning values for the dielectric constant of water in these gels of about 30 in the K–TMA state and 15 in the K–TEA state.
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