However, high ion exchange capacity leads to excessive swelling of polymer on hydration and concomitant loss of mechanical properties.
2.
In contrast to equivalent weight, conventional ion-exchange resins are usually described in terms of their ion exchange capacity ( IEC ), which is the multiplicative inverse or reciprocal of the equivalent weight, i . e ., IEC = 1 / EW.
3.
Since the diffusion coefficient of OH " ions is twice less than that of H + ( in bulk water ), a higher concentration of OH " ions is needed to achieve similar results, which in turn needs higher ion exchange capacity of the polymer.
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