目的 研究增容剂含量对PLA/PCL复合包装膜性能的影响。方法 将不同含量的乙酰柠檬酸三丁脂（ATBC）加入到PLA和PCL树脂中，并搅拌均匀，而后熔融挤出，先造粒后吹膜制得ATBC/PLA/PCL共混膜。对制得的包装膜进行扫描电镜分析，观察其微观断面，并进行力学性能测试，以获得其断裂伸长率和拉伸强度，采用DSC测试分析其熔融结晶行为，并进行氧气透过性测试，以获得其阻隔性能。结果 ATBC对改善PLA与PCL的相容性具有积极作用，显著提高了复合膜的断裂伸长率，从6%提高到250%；随着ATBC 含量的增加，复合膜的氧气透过性能先增大后降低，并对复合膜的玻璃化转变温度和熔融温度有影响。结论 当ATBC的质量占树脂总质量的8%时，共混膜具有最佳的性能。

The work aims to research the effect of the content of ATBC on the performance of PLA/PCL composite packaging film. Different contents of ATBC were mixed with PLA and PCL resin evenly, and then the mixture was melt extruded to prepare ATBC/PLA/PCL blend film first by pelleting and then film blowing. Scanning electron microscope analysis on the prepared packaging film was conducted to observe the microscopic profile. Mechanical property texts were done to obtain the elongation at break and tensile strength. DSC test was conducted to analyze the melting crystallization behavior. Oxygen permeability test was employed to get the barrier property. ATBC had an effective influence on improving the compatibility of PLA and PCL and significantly enhanced the elongation at break of the composite film, from 6% to 250%. As the content of ATBC increased, the oxygen permeability of composite films increased first and then decreased, and it influenced the glass transition temperature and melt temperature of composite films. When the mass of ATBC accounts for 8% of the total mass of resin, the blend film has the optimal performance.