目的 在聚丙烯(PP)五层共挤出软管的外层中引入一定质量分数环烯烃共聚物(COC)材料，研究其对软管阻隔性能的影响。方法 将不同质量分数的COC与PP共混造粒，对共混物进行熔融行为分析，并测试软管的阻氧与阻水性能，共混材料的拉伸强度、弯曲模量、缺口冲击强度等。结果 随着COC添加量的增加，软管管身的氧气透过速率与水蒸气透过速率降低。当COC质量分数为20%时，氧气透过率低至3.3 cm³/(d.m²)，水蒸气透过率为0.6 g/(d.m²)，此时其他性能也能实现较好的平衡。结论 在PP五层共挤出软管的外层中引入COC可以有效地提升软管阻水与阻氧性能。

The work aims to introduce a certain proportion of cyclic olefin copolymer (COC) material into the outer layer of polypropylene (PP) five-layer co-extrusion hoses, and study its effect on the barrier performance of the hoses. The melting behavior of the COC/PP blends of different proportions was analyzed. The oxygen and water resistance properties, tensile strength, bending modulus, notched impact strength of the blends were also tested. With the increase of COC, the permeability of oxygen and water vapor decreased. When the COC dosage was 20 wt%, the oxygen permeability was as low as 3.3 cm3/(d.m)2, and the water vapor permeability was 0.6 g/(d.m)2. At the meantime, the other properties also achieved a good balance. It is concluded that the presence of COC can effectively improve the water and oxygen resistance performance of the PP five-layer co-extrusion hoses.