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    Preparation of PVDF porous membranes by using PVDF-g-PVP powder as an additive and their antifouling property

    Year: 2012

    Journal: Radiation physics and chemistry, 2012, 81 (11) pp 1763-1769, 20130115

    Authors: Chenqi Xu, Wei Huang, Xin Lu, Deyue Yan, Shutao Chen, Hua Huang

    Organizations: School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China, The Dow Chemical (China) Company, No. 936, Zhangheng Road, Shanghai 201203, PR China, CNOOC Research Institute, State Key Laboratory of Offshore Oil Exploitation, Beijing, China

    The hydrophilic PVDF-g-PVP powder was used as additive to prepare a series of PVDF/PVDF-g-PVP blend porous membranes via an immersion precipitation phase inversion process. FTIR-ATR measurements confirmed that the hydrophilic PVP preferentially segregated to the interface between membrane and coagulant. SEM images showed that there was no big change in the membrane cross-section with the amount of PVDF-g-PVP increased. However, the membrane surface roughness increased with the amount of PVDF-g-PVP increased according to AFM data. The mean pore size of membranes reached max when the amount of PVDF-g-PVP was 10 wt%. The water contact angle and filtration experiments revealed that the surface enrichment of PVP endowed the membranes with significantly enhanced surface hydrophilicity and protein-adsorption resistance. The flux recovery of the porous membranes was increased from 37.50% to 77.23% with the amount of PVDF-g-PVP increased from 0 to 50 wt%, also indicating that the antifouling property of the porous membranes was improved.