Abstract: lntegrally skinned asymmetric poly(ether sulfone)membranes were made by dry/wet phase inversion processes. The effects of the dry phase inversion conditions,e.g. evaporation time and temperature on the morphology and N2、H2 permeability of the membranes. were studied. The resuIts indicated that the structure of the membranes, thickness and density of the skin layer were all affected by the dry phase inversion conditions. Preferable membrane properties would be obtained by appropriately controlling the evaporation conditions. For the casting system used a shorter evaporation time and lower evaporation temperature (about 20℃) are in favour of making the membranes have better gas separation properties.

Key words: poly(ether sulfone), asymmetric membrane, dry phase inversion, gas separation