在依据热致相分离机理制备聚4-甲基-1-戊烯（PMP）多孔膜的过程中，冷却条件直接影响微观形貌、进而影响多孔膜的透气和力学性能。采用双螺杆挤出机制备聚4-甲基-1-戊烯/邻苯二甲酸二辛酯/邻苯二甲酸二丁酯（PMP/DOP/DBP）共混材料，并用乙醇有机溶剂萃取获得多孔膜，探讨热致相分离过程中介质、温度和时间对多孔膜结晶、微观形貌、力学和透气性能的影响。结果表明：在冷却介质为水、温度25 ℃、时间30 s条件下制备的PMP多孔膜结晶度为26.8%，孔径分布均匀，孔隙率为67.5%，拉伸强度为8.5 MPa，氧气透过率为9.1 mL/（min∙cm²），呈现出较好的综合性能。

In the process of preparing poly4-methyl-1-pentene (PMP) porous membranes based on the mechanism of thermal induced phase separation, the cooling conditions directly affect the microstructure, air permeability and mechanical properties of the porous membranes. In this paper, poly4-methyl-1-pentene/dioctyl phthalate/dibutyl phthalate (PMP/DOP/DBP) blends were prepared by a twin-screw extruder, and porous membranes were extracted by ethanol organic solvent. The effects of medium, temperature and time on the crystallization, microstructure, mechanics and permeability of the porous membranes were investigated. The results showed that the prepared porous PMP membranes showed good comprehensive properties with a crystallinity of 26.8%, uniform pore size distribution with the porosity of 67.5%, tensile strength of 8.5 MPa and oxygen transmission rate of 9.1 mL/(min∙cm²) under the cooling medium of water, temperature of 25 ℃ and time of 30 s.