Study on the influence of reaction time on the structure and properties of the PVDF membrane modified through the method of atom transfer radical polymerization
writer：Zhao Yiping, Zhao Haiyang, Zhou Kaipeng, Zhang Guifang, Chen Li, Feng Xia
keywords：poly(vinylidene fluoride) membrane, ATRP, PVDF-g-PNIPAAm, thermo-responsive permeability
source：期刊
Issue time：2014年
A thermo-responsive membrane, PVDF-g-PNIPAAm, was successfully prepared from poly(vinylidene fluoride) (PVDF) membrane through surface-initiated atom transfer radical polymerization (ATRP) of a thermo-responsive monomer, N-isopropyl acrylamide (NIPAAm). The influence of the reaction time on ATRP was studied in detail. The grafting membrane was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The results showed that NIPAAm was successfully grafted on the PVDF membrane, the membrane pores became smaller and the reaction time of 36 hours was in favor of surface-initiated ATRP. The thermal stability of PVDF membrane and PVDF-g-PNIPAAm membranes was characterized by differential scanning calorimetry (DSC). Contact angles of membrane surface, water penetration and protein solution permeation were tested. Water contact angles of PVDF membrane reduced after the surface grafting of NIPAAm, which illuminated that the hydrophilicity of the grafted membrane was improved. The PVDF-g-PNIPAAm membranes exhibited good thermo-responsive permeability and antifouling property.