Relation of the free energy interaction parameters to some structural properties of ion-exchange resins.
In our previous publication equations were derived for the calculation of the free energy interaction parameters from ion-exchange equilibrium measurements. These parameters were calculated for several selected cation- and anion-exchange systems. For the demonstration of the structural significance of these parameters our own anion-exchange equilibrium data were processed together with similar data available for other systems in the literature. It has been proved that the calculated free energy interaction parameters are related to the crosslinking of the polymer matrix, to the size of the active group of the resin and to the size of the exchanging counter ion. Since these structural features of the resisns are all important selectivity controlling properties the free energy interaction parameters can be used advantageously for the operational characterisation or comparison of the ion exchangers or other reactive polymers.
Marton
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Analytical Chemistry Research Group of the Hungarian Academy of Sciences, P.O. Box 158, H-8201 Veszprém, Hungary.