Abstract
A novel method for the surface modification of PVDF porous membranes was introduced. Styrene-(N-(4-hydroxyphenyl) maleimide) alternating copolymer SHMI-Br was blended with PVDF to fabricate SHMI-Br/PVDF membranes. The C-Br bond on the SHMI-Br/PVDF membrane was served as initial site of ATRP, and P(PEGMA) brush was grafted on the PVDF membrane. Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR/FTIR) was used to prove the P(PEGMA) brushes were successfully grafted onto the SHMI-Br/PVDF membrane surface. Introduction of P(PEGMA) brushes on the PVDF membrane surface enhanced the hydrophilicity effectively. When the PEGMA degree of grafting was 16.7 wt%, the initial contact angle of PVDF membrane decreased from 98° to 42°. The anti-fouling ability of PVDF membrane was improved significantly after P(PEGMA) brush was grafted. Taking the PEGMA degree of grafting 16.7 wt% as an example, the flux of protein solution was about 151.21 L/(m2 h) when the pH value of the BSA solution was 4.9. As the pH value was increased to 7.4, the flux was changed to 180.06 L/(m2 h). However, the protein solution flux of membrane M3 (PEGMA: 0 wt%) was only 73.84 L/(m2 h) and 113.52 L/(m2 h) at pH 4.9 and 7.4, respectively.
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This work was financially supported by the Natural Science Foundation of Fujian province (No. 2011J01044), the National Basic Research Program of China (973 Program of China, No. 2009CB623402), Scientific Research Foundation in Fuzhou University (2010-XQ-17, 022284), Opening Research Foundation of Key Laboratory of Biomedical Material in Tianjin City (00801103), the Scientific Major Research Project of Fujian Province (2010NZ0001-1).
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Li, Jh., Miao, J., Shao, Xs. et al. Surface modification of PVDF porous membranes. Chin J Polym Sci 31, 994–1001 (2013). https://doi.org/10.1007/s10118-013-1256-1
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DOI: https://doi.org/10.1007/s10118-013-1256-1