Owing to its outstanding hydrophobicity, thermal stability, and chemical resistance, polytetrafluoroethylene (PTFE) has always been the ideal material in the field of membrane contactors. However, the pore structure regulation of the PTFE membrane is challenging due to its poor processability. Herein, a novel and simple strategy to adjust the pore structure of the electrospun PTFE nanofiber membrane was proposed by introducing sodium alginate (SA) into the PTFE/PVA spinning solution. The pore structure of the PTFE nanofiber membrane gradually changed from the nanofiber network to the “sea-island” structure with the increase of SA addition from 0 to 2.5 %, which brought about a decrease in membrane pore size from 1.49 to 0.58 μm. Meanwhile, with the increase of SA addition, there was an obvious improvement in the mechanical properties of obtained PTFE nanofiber membrane because of the higher packing density of PTFE/PVA/SA precursor nanofiber. Finally, the obtained PTFE nanofiber membrane was utilized in the membrane emulsification (ME) process, which exhibited excellent emulsion performance in terms of 0.30 μm average droplet size of Water-in-oil (W/O) emulsion (remaining stable for 30 days).

由于其突出的疏水性、热稳定性和耐化学性，聚四氟乙烯（PTFE）一直是膜接触器领域的理想材料。然而，由于PTFE膜的加工性能较差，其孔结构调控具有挑战性。在此，通过将海藻酸钠（SA）引入PTFE/PVA纺丝溶液中，提出了一种新颖且简单的策略来调整电纺PTFE纳米纤维膜的孔结构。随着SA添加量从0%增加到2.5%，PTFE纳米纤维膜的孔结构逐渐从纳米纤维网络转变为“海岛”结构，膜孔径从1.49μm减小到0.58μm。同时，随着SA添加量的增加，由于PTFE/PVA/SA前体纳米纤维的堆积密度较高，所得PTFE纳米纤维膜的机械性能明显提高。最后，将所得的PTFE纳米纤维膜用于膜乳化（ME）工艺，表现出优异的乳液性能，油包水（W/O）乳液的平均液滴尺寸为0.30μm（30天保持稳定） 。