Abstract Polytetrafluoroethylene (PTFE) is an attractive membrane material due to its superior chemical resistance, thermal stability and strong hydrophobicity. However, PTFE hollow fiber membranes are challenging to produce by conventional technique due to the high solvent resistance and high melt viscosity of PTFE. In this study, novel PTFE hollow fiber membranes composed of pure PTFE nanofibers were firstly fabricated via a scalable and environment-friendly method based on emulsion electrospinning with a non-rotating collector and followed by a high-temperature sintering process. The effects of PTFE/PEO mass ratio and sintering temperature on the morphologies and properties of the resulting membranes were investigated. The prepared PTFE hollow fiber membrane shows the excellent characteristics combining the advantages of both electrospun nanofibers membrane and hollow fiber membrane, such as high porosity (more than 82%), self-supporting and superhydrophobicity. The membrane sintered at 380 °C present the highest mechanical strength, which shows the tensile strength, Young's modulus, strain at break of 30.5 Mpa, 53 Mpa, and 315%, respectively. The permeate flux of the prepared PTFE hollow fiber membrane is about 4.6–8.8 times as that of the commercial PTFE hollow fiber membranes, as well as is approximately 3.2–11.6 times higher than the date of the reported PTFE hollow fiber membranes. Additionally, the prepared membrane shows high and stable flux in long-term and rising salinity experiments, indicating it is very promising for membrane distillation (MD) application and even for the treatment of hyper-saline wastewater.

中文翻译：

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乳液静电纺丝烧结膜蒸馏制备新型聚四氟乙烯中空纤维膜

摘要 聚四氟乙烯 (PTFE) 具有优异的耐化学性、热稳定性和强疏水性，是一种极具吸引力的膜材料。然而，由于 PTFE 的高耐溶剂性和高熔体粘度，用传统技术生产 PTFE 中空纤维膜具有挑战性。在这项研究中，由纯 PTFE 纳米纤维组成的新型 PTFE 中空纤维膜首先通过基于乳液静电纺丝和非旋转收集器的可扩展和环境友好的方法制备，然后是高温烧结工艺。研究了 PTFE/PEO 质量比和烧结温度对所得膜的形态和性能的影响。所制备的聚四氟乙烯中空纤维膜结合了电纺纳米纤维膜和中空纤维膜的高孔隙率（大于82%）、自支撑和超疏水等优点。在 380 °C 下烧结的膜具有最高的机械强度，其拉伸强度、杨氏模量、断裂应变分别为 30.5 Mpa、53 Mpa 和 315%。制备的 PTFE 中空纤维膜的渗透通量约为商用 PTFE 中空纤维膜的 4.6-8.8 倍，并且比报道的 PTFE 中空纤维膜的日期高约 3.2-11.6 倍。此外，所制备的膜在长期和不断上升的盐度实验中显示出高且稳定的通量，