Traditional method for modification of PVC ultrafiltration membrane depends mainly on blending, but inevitably suffers from additive leakage and poor compatibility between components. Herein, we synthesized amphiphilic functional terpolymers with adjustable chemical structures through in-situ copolymerization of vinyl chloride, acrylonitrile, and dimethyl aminoethyl acrylate, subsequently prepared the terpolymer ultrafiltration membranes by non-solvent induced phase separation. The novel terpolymers endow the membranes with amphiphilic and pH-responsive performances. Compared with the blend membrane, the copolymer had the more stable covalent bonding, and then its hydrophilic segments could anchor and enrich stably to the membrane surface without diffusing into the aqueous phase. As a result, the copolymer membrane not only effectively overcame the disadvantages of blend membrane, but also showed excellent antifouling and permeable properties. Its water flux significantly increases to 469.41 L/(m²·h·bar) from 35.67 L/(m²·h·bar) of pure PVC membrane while the adsorption capacity for bovine serum proteins was reduced. Meanwhile, the copolymer membranes exhibited strong pH-dependent adsorption for anionic dyes and heavy metal ions. The maximum adsorption capacities occurred respectively at pH values of 3.5 and 6.0. In addition, the copolymer membrane can be regenerated by desorbing the adsorbed anionic dyes and heavy metal ions respectively at pH 10 and pH 3.5. This research provides a new strategy for facile preparation of amphiphilic functional ultrafiltration membranes and effective removal of micropollutants.

传统的PVC超滤膜改性方法主要靠共混，但不可避免地存在添加剂渗漏、组分相容性差等问题。在此，我们通过氯乙烯、丙烯腈和丙烯酸二甲基氨基乙酯的原位共聚合成了化学结构可调的两亲功能三元共聚物，随后通过非溶剂诱导相分离制备了三元共聚物超滤膜。新型三元共聚物赋予膜两亲性和 pH 响应性能。与共混膜相比，共聚物具有更稳定的共价键，其亲水性链段可以稳定地锚定和富集到膜表面而不会扩散到水相中。因此，该共聚物膜不仅有效克服了共混膜的缺点，而且表现出优异的防污透水性能。其水通量显着增加至 469.41 L/(m² ·h·bar) 从 35.67 L/(m ² ·h·bar) 纯 PVC 膜，同时对牛血清蛋白的吸附能力降低。同时，共聚物膜对阴离子染料和重金属离子表现出强烈的 pH 依赖性吸附。最大吸附量分别出现在 pH 值 3.5 和 6.0 时。此外，共聚物膜可以通过在pH 10和pH 3.5下分别解吸吸附的阴离子染料和重金属离子来再生​​。该研究为简便制备两亲功能超滤膜和有效去除微污染物提供了新策略。