目的 提高聚己内酯（PCL）薄膜对氧气及水蒸汽的阻隔性。方法 利用双螺杆挤出机， 对 PCL与聚碳酸亚丙酯（PPC）进行共混挤出制备薄膜材料， 并对PCL/PPC共混膜的相容、 热学、 阻隔及力学等性能进行测量。结果 当PPC含量较少或较多时， PCL与PPC具有一定的相容性， 而在中间含量时出现了相分离； PCL/PPC 薄膜对氧气的透过系数和水蒸气的透过率随着 PPC 含量的增加而降低；PPC的加入提高了PCL的强度及模量， 在共混比例较小时， 共混膜有相对较好的抗撕裂性能。结论添加适量的PPC能使PCL表现出更好的氧气和水蒸汽阻隔性及较好的力学性能。

The study aimed to improve barrier of PCL film against oxygen and water vapor. The PCL/PPC composite films were prepared by melt blend via twin-screw extrusion. The miscibility, thermology, barrier and mechanical properties of the PCL/PPC composite film were investigated. With the addition of a small or a large amount of PPC, the PCL/PPC blends showed good miscibility. But blends with moderate PPC contents presented phase separation. The penetration coefficient of oxygen and the penetration rate of water vapor showed linear decrease with the increase of PPC content. With addition of PPC, PCL presented higher modulus and strength. The composite film showed better tear resistance at low blending ratio. The PCL film exhibited much better barrier properties against oxygen and water vapor and relative higher mechanical strength with suitable addition of PPC.