Research progress in PVDF Ultrafiltration Membranes Prepared by phase Inversion Method and Their Modifications

The newly research progress of poly (vinylidene) fluoride (PVDF) membrane in preparation and modification is reviewed. The research focuses on the effects of solvents and nonsolvents on the pore and structure of PVDF membranes by phase inversion. The modification methods of PVDF ultrafiltration membranes including substance modification and surface modification are introduced. The substance modification method includ ed physical blending and copolymerization, the surface modification included radiation induced grafting and low-temperature plasma. It was evident that physical blending was the main trend of modification of PVDF ultrafiltration membrane. The PVDF ultrafiltration membrane as a new technique in water treatment application is introduced briefly.