| Abstract: | Cationically charged poly(allylamine) (PAA) membranes having various water contents [0.49 < H < 0.63 (g H2O/g wet membrane)] were prepared. Sorption and permeation of simple salts (sodium chloride and sodium tetraphenylborate) were investigated, taking into account the state of the water in these membranes. The weight ratios of freezable water and free water to total water (Wfz/Wt, and Wf/Wt) in the membranes were estimated by means of DSC and pulsed 1H-NMR measurements, respectively. Partition coefficients K for total water were converted into those in freezable and free water, Kfz and Kf, using Wfz/Wt and Wf/Wt. The permeability of both salts in the membranes could be interpreted satisfactorily by an equation derived from the Teorell-Meyer-Sievers theory using values of Kf. The free water is mainly involved in the permeation of simple salts through PAA membranes while bound water hardly takes part. |
