采用自由基聚合合成两亲性聚离子液体共聚物(P (MMA-co-BVIm-Br))，并将该共聚物与聚偏氟乙烯(PVDF)通过相转化法共混成膜。采用红外光谱仪(FT-IR)、接触角测量仪、Zeta 电位计以及扫描电镜等对共混膜表面的化学结构、荷电特性以及膜的表面形貌等进行了表征。研究了共混膜对蛋白质的分离性能，结果表明，当溶液pH 值低于蛋白质分子等电点时，共混膜的截留率、可逆污染率和通量恢复率均高于等电点时的数值，这说明该膜具有良好的荷正电性和抗污染特性。
The amphiphilic poly(ionic liquid)copolymer P(MMA-co-BVIm-Br)was synthesized by radical poly-merization process.P (MMA-co-BVIm-Br)was used to prepare P (MMA-co-BVIm-Br)/PVDF blend mem-branes.Infrared spectroscopy (FT-IR),contact angle,zeta potential instrument and scanning electron micros-copy (SEM)were used to characterize the structure and properties of the blend membranes.The protein separa-tion properties of the blend membranes were also studied.The results indicated that the pH value of the solution could change the charged property of the protein,which affected the separation properties of the membranes. When the pH value of solution was below the isoelectric point of the protein,the rejection,reversible fouling rate and the flux recovery ratio of the blend membranes were all increased.These phenomena suggested that the blend membranes had good charged and anti-fouling properties.
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