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Radiation synthesis and characterization of PVDF-g-N-IPAAm temperature-sensitive membranes

LIU Qi ZHU Zhiyong YANG Xiaomin CHEN Xiliang SONG Yufeng (Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800)  
N-IPAAm monomers were grafted in/on Poly vinylidene fluoride (PVDF) micro-pore membrane by γ-irradiation. The grafting was characterized by Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements. Contact angle on the surface, electrical conductance and water penetration through the grafted membranes were tested. The results show that the N-isopropylacrylamide (N-EPAAm) monomers were successfully grafted on and inside the PVDF porous membrane. The hydrophilicity of the grafted membrane was improved and the membrane exhibits clearly temperature-sensitive permeability to water as expected, i.e., the permeability of water changes dramatically as the temperature goes above the lower critical solution temperature (LCST) of N-IPAAm.
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