POROUS POLY(VINYLIDENE FLUORIDE) HOLLOW FIBER MEMBRANES COMPOSED OF SPHERICAL PARTICLES CONTAINING POLYMERIC NANOFIBERS

摘要

A porous poly(vinylidene fluoride) hollow fiber membrane and a method for preparing the same are provided to exhibit excellent performance particularly in the microfiltration field by having good blocking ratio and good water permeability at the same time while maintaining superior tensile strength. A porous poly(vinylidene fluoride) hollow fiber membrane comprises: an inner layer(1) which is formed in the membranes, and in which a plurality of polymeric nanofibers having an average diameter of 500 nm or less are exposed on the section of the membranes, and a plurality of spherical fine particles with an average particle size of 1 to 5 micrometers(mum) are contained at the same time; an intermediate layer(2) which is formed on an upper part of the inner layer, and in which a plurality of polymeric nanofibers having an average diameter of 500 nm or less are exposed on the section of the membranes, and a plurality of middle-sized spherical particles with an average particle size of exceeding 5 micrometers(mum) to 10 micrometers(mum) are contained at the same time; and a surface layer(3) which is formed on an upper part of the intermediate layer, and in which a plurality of polymeric nanofibers having an average diameter of 500 nm or less are exposed on the section of the membranes, and a plurality of spherical fine particles with an average particle size of 1 to 5 micrometers(mum) are contained at the same time.