Preparation and characterization of the antifouling porous membranes from poly（vinylidene fluoride）-graft-poly（N-vinyl pyrrolidone） powders

Porous membranes were prepared using the phase inversion method from poly（vinylidene fluoride）-graft- poly（N-vinyl pyrrolidone） （PVDF-g-PVP） powders, which were synthesized via γ-ray induced graft polymer- ization （pre-irradiation）. Chemical compositions, thermal behavior, morphology and hydrophilicity of the mem- branes were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, ele- ment analysis, thermalgravimetric analysis, differential scanning calorimetry, scanning electron microscopy and contact angle measurements, respectively. Permeation experiments were conducted to evaluate the water flux, and the dynamic BSA fouling resistance performances were investigated, too. All the experimental results in- dicate that the PVDF-g-PVP membranes demonstrate better separation performances over the pristine PVDF membrane.