Influence of molecular weight on performance of polyacrylonitrile ultrafiltration membrane
This article reported an investigation on the structure and performance of the polyacrylonitrile(PAN)ultrafiltra-tion membranes prepared by a phase-transformation method using four types of PAN with different viscosity average-mo-lecular weights(Mη≈2.2×105 g/mol,6×105 g/mol,7×105 g/mol,8×105 g/mol).PEG-4000 or SiO2 as a common ad-ditive was added to the solution to adjust the microstructure and performance of the ultrafiltration membranes.The results indicated that the water flux and retention flux of the ultrafiltration membranes decreased with an increase in the molecular weight of PAN.However,there is a reduction in the finger shaped-hole and hydrophilicity with an increase in the molecular weight of PAN.In contrast,the finger shaped-hole and hydrophilicity were improved with the addition of the additives.Meanwhile,the water flux of the PAN ultrafiltration membrane with a high molecular weight increased from 100 to 3 000 L/(h·bar)after the addition of the additives,and the average concentration of the filtered oil-water mixture was 5 mg/L.
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