Study on Hydrophilic Modification and Antibacterial Activity of PVDF Ultrafiltration Membrane by MMA-co-ILS
In order to improve the hydrophilicity of ultrafiltration membranes,an innovative method was adopted in this study:the introduction of ionic liquids with hydrophilic properties through in-situ polymerization technology.In the experiment,l-butyl-3-vinylimidazole bromide(ILs)was used as a hydrophilic additive,while methyl methac-rylate(MMA)was introduced as a compatibilizer.In the specific operation process,PVDF powder was first mixed with N,n-dimethylacetamide(DM Ac)to ensure the complete dissolution of PVDF powder.Subsequently,a prede-termined amount of ILs and MMA is added to the solution to ensure that the additives are uniformly dispersed during the polymerization process by precisely controlling the reaction conditions to achieve effective integration of the ionic liquid.Then,the final PVDF composite membrane was prepared by phase conversion technique.The experimental results show that the performance of the modified PVDF membrane is obviously improved.In particular,the water contact Angle decreased significantly from 86.99° to 68.62°,the pure water flux was as high as 552.7 L/(m2·h),the equilibrium water content increased from 11.8％to 59.68％,the retention rate of bovine serum protein(BSA)increased compared with that of pure PVDF membrane,reaching 90.13％,and it had strong antibacterial activity.It has a good application prospect in the field of water treatment separation membrane.
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