Asymmetric polivinylidenfluoride (pvdf) radiation grafted membranes: preparation and performance in reverse osmosis application

A new type of reverse osmosis membrane has been synthesized. Membranes were prepared starting from asymmetric PVDF films, obtained by the casting and gelation technique and modified by radiochemical grafting and sulphonation. These membranes were tested in an RO laboratory plant and their performances were determined as a function of preparative parameters.The influences of evaporation time and temperature grafting and solvents were investigated.These membranes exhibit permeabilities as high as 2000 l/m²d and sodium chloride rejections up to 70%.