选取经辐射接枝的PVDF-g-PVP接枝物粉体及相同PVP含量的PVDF/PVP共混物粉体，利用浸没－沉淀相转化法制备微滤膜，并通过元素分析、红外光谱（FT-IR）、热重分析（TG）、差示扫描量热（DSC）、扫描电镜（SEM）对PVDF膜、PVDF-g-PVP及PVDF/PVP微滤膜的结构和性能进行了表征，同时对膜的接触角和水通量进行了测试。实验结果表明，PVDF-g-PVP及PVDF/PVP微滤膜的亲水性随PVP含量的增加而增强，但二者的热稳定性与PVDF膜相比略有降低。由于PVDF/PVP微滤膜中的PVP在成膜过程中主要作致孔剂，大部分会流失，因此与PVDF-g-PVP微滤膜相比，相同PVP含量的铸膜液在成膜后PVDF/PVP膜中的N含量较低，膜表面孔数较多，水通量较大，但亲水性略低。

 PVDF-g-PVP powders synthesized via radiation grafting metnod and PVDF/PVP blends were cast into microfiltration (MF) membranes via the phase-inversion method. The PVDF membrane, PVDF-g-PVP and PVDF/PVP microfiltration membranes were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric(TG) analysis, differential scanning calorimetry(DSC) and scanning electron microscopy(SEM). The contact angle and water flux were also measured. The results con?rmed that the existence of PVP improved the hydrophilicity of the MF membranes cast from PVDF-g-PVP grafted powders and PVDF/PVP blends, although the thermal stability of PVDF-g-PVP and PVDF/PVP membranes was slightly reduced. PVP in the blend membranes acted as pore former, and most of them lost during the membrane preparation process. For the above-mentioned reasons, PVDF/PVP membranes had lower N content, more pores, higher water flux and lower hydrophilicity, in contrast to PVDF-g-PVP membranes with the same PVP content in the casting solution.

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