Surface modification of PVDF membranes for water treatment via hydrophilic thermal cross-linking method

Abstract

Abstract Surface modification of poly(vinylidene)fluoride flat and hollow fiber membranes was performed via thermal cross-linking of acrylic acid. Two-stage cross-linking method was developed which enabled the interfacial reaction for effective cross-linked layer formation at surface. Hydrophilization of membranes at surface as well as at the inside of the pore was conducted by suction mode for solution application. Scanning electronic microscopy (SEM) images proved the formation of hydrophilic cross-linked layer to improve the performances of the membrane and antifouling characteristics. Modification of the membranes enhanced the stability of the membrane, and the chemical resistances were much improved. Mini pilot plant test proved the stability of the modified membranes in terms of flux and trans-membrane pressure (TMP) build up.