Abstract
The osmosis through dense membrane of cellulose diacetate (CDA), cellulose triacetate (CTA) and of poly(γ-methyl L-glutamate) (PMLG) has been characterized concerning several membrane parameters, such as filtration coefficient, Lp, permeability coefficient of KCl, ω, and reflection coefficient, σ. Lp and ω of PMLG were higher than those of CTA whose equilibrium partition coefficient and degree of hydration were almost identical with those of PMLG. The differences in Lp and ω could be ascribed to the difference of diffusion mechanism of these membranes. On the other hand, reflection coefficient of these membranes, which is directly related to the membrane osmosis, was given by the following order:The values of Lp, ω, and σ in turn were related to the frictions, fwm (water-membrane), f2m (co•ion-membrane) and f2w (co•ion-water). The order of σ was determined by the fact that f2m of PMG-KCl system was considerably lower than those of cellulosic systems. This difference of f2m is attributable to the fact that α-helical PMLG has loosely packed side chain region through which the solute permeate the membrane easily, on the other hand, cellulosic membranes consisting of linear main chain have no such region.
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