Preparation of modified PVDF hollow fiber separating membrane

PVDF hollow fiber blood separating membrane was fabricated by using dry-wet phase inversion method.The hydrophilicity of the membrane material was improved by introduction of the crosslinking reactant of polyvinyl alcohol(PVA) with glutaraldehyde into the casting solution.The effect of solid content of PVDF,dosage of PEG,etc.on the membrane performance was investigated.The results indicated that the modification of PVDF blood separating membrane significantly increases the hydrophilicity,and decreases the protein adsorption and enhances the chemical stability.The tensile and burst pressure of the membrane increase while the water flux and pore size decrease with the increase of the solid content of PVDF.The mechanical performance of the membrane material changes slightly while the water flux increases remarkably with the increase of addition of PEG.