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...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 ~afted. Taking the PEGMA degree of grafting 16.7 wt% as an example, the flux of protein solution was about 151.21 L/（m 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.展开更多
基金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)+2 种基金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)
文摘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 ~afted. Taking the PEGMA degree of grafting 16.7 wt% as an example, the flux of protein solution was about 151.21 L/（m 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.
