Interpolymer ultrafiltration membranes prepared from poly(vinylidene fluoride) and poly(1-vinyl-3-methylimidazolium iodide)

Porous interpolymer anion exchange membranes were prepared from poly-(vinylidene fluoride) and poly(l-vinyl-3-methylimidazolium iodide). Depending on the membrane composition, the hydraulic permeability and the membrane conductance were varied over four orders of magnitude. The rejection of potassium chloride, calcium chloride, and methylene blue solutions was determined during ultrafiltration. A model was developed to account for the observed salt rejection. The membrane porosity and tortuosity parameters for this interpolymer membrane system were compared with an analogous system of cation-exchange membranes derived from poly(styrenesulfonic acid) and poly(vinylidene fluoride).