Collect. Czech. Chem. Commun. 1988, 53, 1247-1259

Dialysis experiments with asymmetric cellulose acetate membranes

Hans-Hartmut Schwarza, Jaromír Lukášb and Jiří Vacíkb

a Institute of Polymer Chemistry “Erich Correns”, Academy of Sciences of G.D.R., 1530 Teltow-Seehof, G.D.R.
b Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6, Czechoslovakia


Cellulose acetate membranes for ultrafiltration produced by phase inversion have an asymmetric structure in the cross-section. In spite of this assymetry it is possible to characterize such membranes by dialysis. The asymmetry has no influence on the permeability for solute poly(oxyethylene). The membrane structure was varied systematically by annealing. The influence of solution concentration, dialysis time and temperature was also investigated. Statements are made on the annealing influence. A relationship between diffusion permeability and the true rejection is discussed.