Abstract
The superstructure of polymer alloys responsible for their functions is most readily controllable at varying polymers, polymer blend ratios, solvents and temperatures. Dialysis membranes made of polymer alloys may have various pure water and solute permeabilities, pore sizes and pore size distributions. Commercially available FLX-12GW dialyzers and three kinds of test dialyzers of varying coagulation rate of forming PEPA membranes were prepared. Filtration experiments were made with a mixed solution of dextrans ranging in their molecular weights from 3, 000 to 60, 000. Reflection coefficient of dextrans was determined by Spiegler-Kedem equation from real rejection data calculated from rejection data by the velocity variation method. Reflection coefficient of FLX-12GW increased with molecular weights ranging from 10, 000 to 50, 000 of substances. Coagulation rate of forming PEPA membrane decreases with reflection coefficient.
