Preparation of polysulfon hollow fiber membrane filters and their structural and permselective characteristics

Abstract

The polysulfon hollow fiber membrane filters were prepared by the phase inversion method. The membrane preparing solution having the phase inversion or transition temperature, below which a uniform solution changed into two separated phases, and the core solution having both comparatively mild coagulating effect and the lower temperature than the transition temperature were extruded simultaneously from a double ring nozzle. The membrane preparing solution was estimated to complete coagulation almost entirely before being introduced into the outer side coagulating liquid. The hollow fiber membrane filter prepared as mentioned above had circular pores in the outer surface and the uniform network structure in the cross section, but irregularly shaped pores in the inner surface. The observable maximum pore diameter in the inner surface was defind and utilized as the characteristic parameter of the membrane filter, which correlated quantitatively to permeabilities of uniform latex particles, permeabilities of the bovine serum proteins and bubbling points.