Abstract
The preparation of membranes by the dissolution of polyamide in a protic solvent and subsequent reprecipitation leads to a surface structure which is microporous, and an underlying support structure which is alveolar. The nature of the surface and underlying material depends strongly on the relative quantities of polymer and solvent in the dope, and maturation conditions. Membranes prepared in this way have water fluxes ranging to 10 4l/m 2-hr and are suitable for micro-and ultrafiltration. Their properties can be explained by considering the nature of the dissolution and reprecipitation processes.
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