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The conductivity of a cation‐exchange resin

1956; Wiley; Volume: 20; Issue: 96 Linguagem: Inglês

10.1002/pol.1956.120209610

1542-6238

P. Meares,

Analytical Chemistry and Sensors

Abstract An equation relating the equivalent conductance of ions in a cation‐exchange resin to their conductance in water and the volume fraction of polymer in the swollen resin has been tested using data for the conductance of potassium ions in crosslinked polymethacrylic acid. The equation is successful for degrees of ionization at which counterion binding is not large and for degrees of swelling sufficiently high for the network to exert no sieve action on the ions. The concentration dependence of conductivity in the resin is determined by a relaxation effect similar to that in free solution and an electrophoretic which has been treated using the Kozeny law for fluid flow in a porous medium. These effects tend to cancel one another so that the concentration dependence is small. When the mean pore diameter of the network approaches the diameter of the counterions the observed conductivity is less than the theoretical value.