Due to the excellent solvent resistance properties of polyketone (PK), the traditional non-solvent induced phase separation (NIPS) preparation process is both highly toxic and complex. In this work, we successfully and efficiently prepared PK hollow fiber membranes using the thermally induced phase separation (TIPS) method, capitalizing on a low-toxicity diluent system of polyethylene glycol 300 (PEG300) and triethylene glycol (TEG). Moreover, by simply adding TEG to the diluent, we achieved a reduction in the spinning temperature, resulting in membranes that display an interconnected structure formed through the liquid-liquid phase separation process. We systematically investigated the impact of the TEG ratio in the diluent, PK concentration, and propylene carbonate (PC) ratio in the bore liquid on the phase diagram, membrane morphology, and characteristics of PK membranes. Increasing the PC ratio in the bore liquid significantly improves the inner surface porosity due to PC penetration into the dope solution, leading to high water permeability. Additionally, the resulting PK membrane exhibits exceptional resistance to organic solvents. This work introduces a novel approach to lower the spinning temperature for PK membrane preparation in the TIPS process while preserving the membrane structure and properties.

由于聚酮（PK）优异的耐溶剂性能，传统的非溶剂诱导相分离（NIPS）制备工艺毒性大且复杂。在这项工作中，我们利用热诱导相分离（TIPS）方法，利用聚乙二醇300（PEG300）和三甘醇（TEG）的低毒性稀释剂系统，成功高效地制备了PK中空纤维膜。此外，通过简单地将 TEG 添加到稀释剂中，我们实现了纺丝温度的降低，从而使膜呈现出通过液-液相分离过程形成的互连结构。我们系统地研究了稀释剂中TEG的比例、PK浓度和孔液中碳酸丙烯酯(PC)比例对PK膜的相图、膜形貌和特性的影响。由于 PC 渗透到涂料溶液中，增加孔液中的 PC 比例可显着改善内表面孔隙率，从而导致高透水性。此外，所得的 PK 膜对有机溶剂具有出色的耐受性。这项工作介绍了一种新方法，可降低 TIPS 工艺中 PK 膜制备的纺丝温度，同时保留膜的结构和性能。