Nafion has been widely used in electrochemistry, but there are only a few reports on its application in other fields, such as, gas separation, even though it exhibits good performance. The primary reason for that is the high cost of Nafion and making a composite membrane with a thin Nafion layer is a potential solution to solve this problem. In this study, a novel Nafion‐PTFE composite hollow fiber membrane, which had a thin (~5 μm) and detect‐free Nafion layer on PTFE surface, without Nafion filling substrate pores was developed, differing from the reported ones in which Nafion resin was required to impregnate into porous PTFE membrane as thorough as possible to ensure the ion conductivity and operation stability. The surface morphology, crystallite, solubility in ethanol/water mixture, and water uptake of membranes were systemically investigated. The gas permeance tests were also conducted. The permeances of different gasses of prepared composite membranes were significantly enhanced compared with the commercial membranes due to the decrease of Nafion thicknesses, while the selectivity remained the same, verifying the detect‐free structure of Nafion layer on PTFE substrate. This study provided a good reference for the preparation and application of low‐cost Nafion composite membranes.

中文翻译：

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新型Nafion-PTFE复合中空纤维膜的制备与表征

Nafion已在电化学中得到广泛使用，但是即使其表现出良好的性能，也只有很少的报道报道其在其他领域的应用，例如气体分离。其主要原因是Nafion的高成本，并且制造具有薄Nafion层的复合膜是解决该问题的潜在解决方案。在这项研究中，开发了一种新颖的Nafion-PTFE复合中空纤维膜，该膜在PTFE表面上具有很薄的（〜5μm）且无检测的Nafion层，并且没有Nafion填充基材孔，与报道的Nafion树脂不同需要尽可能彻底地浸入PTFE多孔膜中，以确保离子电导率和操作稳定性。系统地研究了表面形态，微晶，在乙醇/水混合物中的溶解度以及膜的吸水率。还进行了气体渗透测试。由于Nafion厚度的减少，与市售膜相比，制得的复合膜的不同气体的渗透率显着提高，而选择性却保持不变，这证明了PTFE基底上Nafion层的无检测结构。该研究为低成本Nafion复合膜的制备和应用提供了很好的参考。