Hydrophilic polymers with low affinity for foulants were broadly utilized as functional membrane surface modifiers to mitigate fouling owing to superior hydration capability. Herein, novel hydrophilic hyperbranched poly(N-acryoyl morpholine) (HPA) synthesized through one-step RAFT polymerization was immobilized onto commercial PVDF microfiltration membrane surface using biomimetic adhesion polydopamine as an intermediate reaction platform. The surface composition and morphology of HPA decorated membranes (M-PD/HPA) were examined, demonstrating that the nano-sized HPA was facilely anchored on the membrane surface without obviously changing membrane pore size and distribution. In comparision with hydrophobic pure membrane (M-PVDF), hydrophilic and underwater superoleophobic M-PD/HPA exhibited excellent multiple defense capability toward oil, protein and bacteria due to the presence of a steric repulsive barrier of hydrated HPA layer. For model hexane-in-water emulsion separation at 0.02 MPa, permeation flux of M-PD/HPA up to 149.8 L m⁻² h⁻¹ was improved by three times and the rejection was up to 99.5%. Importantly, for the separation of complex artificial oily wastewater, relevant flux reduction of M-PD/HPA was decreased from 60.9% of M-PVDF to 36.8% and flux recovery ratio of M-PD/HPA was increased from 34.8% to 82.6%. Therefore, M-PD/HPA has a promising prospect for emulsified oil separation and water purification.

对污垢物的亲和性低的亲水性聚合物由于具有超强的水合作用能力而被广泛用作功能性膜表面改性剂，以减轻污垢。本文中，通过仿生粘附聚多巴胺作为中间反应平台，将通过一步RAFT聚合合成的新型亲水性超支化聚（N-丙烯酰基吗啉）（HPA）固定在商用PVDF微滤膜表面上。检查了HPA装饰膜（M-PD / HPA）的表面组成和形态，表明纳米级HPA可以轻松固定在膜表面，而不会明显改变膜的孔径和分布。与疏水性纯膜（M-PVDF）相比，亲水性和水下超疏油性M-PD / HPA对油具有出色的多重防御能力，蛋白质和细菌是由于水合HPA层存在空间排斥屏障而引起的。对于0.02 MPa的模型己烷-水乳液分离，M-PD / HPA的渗透通量高达149.8 L m^-2  h ^-1提高了三倍，剔除率高达99.5％。重要的是，对于分离复杂的人造含油废水，M-PD / HPA的相关通量减少量从M-PVDF的60.9％降低到36.8％，M-PD / HPA的通量回收率从34.8％增加到82.6％ 。因此，M-PD / HPA在乳化油分离和水净化方面具有广阔的前景。