Synthesis, characterization and performance of asymmetric PVDF ultrafiltration membranes with mixing of polyethylene glycols of different molecular weights as additives

Flat sheet asymmetric PVDF membranes were prepared by phase inversion method. Dimethyl acetamide was used as solvent and water was used as coagulant. Mixing of polyethylene glycols (PEG) of different molecular weights namely as PEG 200, PEG 600, PEG 1500 and PEG 6000 was used as polymeric additives in the casting solution. The morphology of membranes was analyzed by scanning electron microscope and performance of membranes was evaluated in terms of pure water flux (PWF) and BSA rejection. Results show that PEG additives are pore former and the addition of PEG additives can improve the performance of membranes. With increasing MW of PEGs from 600 to 1500 at the first PWF decreased and BSA rejection increased and from 1500 to 6000 PWF increased and BSA rejection decreased. All membranes have PWF and surface porosity (was shown of SEM images) more than pure PVDF membrane

کلیدواژه ها:

Poly (vinylidene fluoride) ، Poly(ethyleneglycol) ، Membrane ، BSA rejection ، Asymmetric