Polydopamine (PDA) was coated on poly(vinylidene fluoride) (PVDF) membranes with different structures to select the most suitable structure for achieving outstanding hydrophilicity, permeability, stability, and antifouling properties. PVDF membranes were prepared with different solvents (N‐methyl‐2‐pyrrolidone [NMP], N,N‐dimethylacetamide [DMAc], N,N‐dimethylformamide [DMF], NMP/DMAc, NMP/DMF, DMAc/DMF, and NMP/DMAc/DMF), and the factors that influenced the phase inversion were discussed. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM) were employed to characterize various membranes. Results indicated that PDA was coated on PVDF membrane surface and formed a smoother PDA layer. Water contact angle measurement confirmed the increased hydrophilicity of PDA modified membranes, but water flux decreased due to the adhesion of PDA on pore walls. The decrease of static adsorption of bovine serum albumin (BSA), the increase of flux recovery ratio (FRR), and the decline of fouling resistance for PDA modified membranes demonstrated that their antifouling properties have been improved significantly. The membrane prepared with NMP/DMAc displayed the highest decay rate of contact angle (16.6 ± 1.27%), the higher water flux (1358.5 ± 33.87 L m⁻² h⁻¹), the highest decrease of BSA adsorption (129.3 ± 5.02 μg cm⁻²), the highest increase rate of BSA rejection (13.6 ± 0.42%), and the highest FRR (92.8 ± 1.42%). This indicated that NMP/DMAc membrane possessed the most suitable structure to improve membrane performances by PDA coating.

中文翻译：

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用多多巴胺改性的多结构聚偏二氟乙烯膜的工程设计，以实现超亲水性，优异的渗透性和防污性能

将聚多巴胺（PDA）涂覆在具有不同结构的聚偏二氟乙烯（PVDF）膜上，以选择最合适的结构，以实现出色的亲水性，渗透性，稳定性和防污性能。PVDF膜是用不同的溶剂制备的（N-甲基-2-吡咯烷酮[NMP]，N，N-二甲基乙酰胺[DMAc]，N，N讨论了二甲基甲酰胺[DMF]，NMP / DMAc，NMP / DMF，DMAc / DMF和NMP / DMAc / DMF），以及影响相转化的因素。傅里叶变换红外（FTIR）光谱，扫描电子显微镜（SEM）和原子力显微镜（AFM）用于表征各种膜。结果表明，PDA被涂覆在PVDF膜表面上并形成较光滑的PDA层。水接触角测量证实了PDA改性膜的亲水性增加，但是水通量由于PDA在孔壁上的粘附而降低。牛血清白蛋白（BSA）静态吸附的减少，通量回收率（FRR）的增加），而PDA改性膜的耐污垢性下降表明其防污性能已得到显着改善。用NMP / DMAc中制备的膜显示的接触角（16.6最高衰变率± 1.27％），较高的水通量（1358.5 ± 33.87 L M ^-2 ħ ^-1），BSA吸附的最高减少（129.3 ± 5.02微克cm ^-2），BSA排斥率最高（13.6 ± 0.42％）和FRR最高（92.8 ± 1.42％）。这表明NMP / DMAc膜具有最合适的结构，可通过PDA涂层改善膜性能。