Preparation and performance of cellulose acetate-polyurethane blend membranes and their applications - II

Characterization and application of ultrafiltration membranes are of great interest today, both as a tool in choosing the proper membrane for the filt ration system used and in the development of new and better membranes. Cell ulose acetate was blended with polyurethane in a polar solvent in the prese nce of polyvinylpyrrolidone as an additive. The effects of polymer composit ion and additive concentration on membrane compaction, pure water flux, wat er content, membrane hydraulic resistance and morphological studies were di scussed. Measurement of transmembrane flux and appropriate macro solute rej ection during stirred ultrafiltration of aqueous solutions of proteins and metal ions chelated with polyethyleneimine were carried out individually us ing CA/PU blend membranes. (C) 2000 Elsevier Science B.V. All rights reserv ed.