Abstract
Reinforced polysulfonamide membranes were prepared by the method of continually casting membrane on a polyester web. The variables for the process of making membranes, such as casting rates, evaporation periods, compositions and temperature of gelation bath were discussed. The membranes could be dried without changing their properties. The ranges of average pore radius could be controled from 200 to 1200 Å by changing compositions of casting solution and conditions of preparation of membranes, the corresponding membrane fluxes were 300 to 800 ml/cm 2.hr. at the pressure of 2.5 kg/cm 2 and with distilled water as feed. The pore sizes of the membranes were changed only a little after the treatment in boiling water and even the heat-treatment under vapor pressure of 0.5 kg/cm 2, but the fluxes were increased. The membranes are also stable in solutions of PH 1 to 12, and resistant to solvents and oxidation. The membranes can be used as ultrafiltration membranes and supporting membranes for composite membranes.
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