目的 为了改善聚乙烯(PE)透湿性差、气体选择透过比低等性能，将高透湿性的聚己二酸丁二醇酯-对苯二甲酸丁二醇酯(PBAT)以熔融共混的方式改性PE。方法 以PE为主体，添加质量分数为10%、20%、30%的PBAT，采用流延共混法制备PE/PBAT共混薄膜，测试其热学性能、力学性能、气体透过性能和透湿性能，并用来包装迷你黄瓜以研究薄膜的保鲜效果。结果 PBAT的加入使PE的力学性能、气体透过性能和透湿性能均得到提升。与PE相比，PBAT的质量分数为30%时，薄膜的H2O透过系数提高了2.42倍，CO2 /O2透气比值从3.3提高至4.4，且在迷你黄瓜整个贮藏过程中Vc含量下降得最为缓慢，感官品质保持较好，迷你黄瓜在贮藏38 d内均具有良好的商业价值和食用价值。结论 PBAT的添加改善了PE的性能，提高了迷你黄瓜的贮藏时间，可见共混薄膜具有较好的使用前景。

The work aims to modify polyethylene (PE) by blending poly adipate butyl terephthalate with high moisture permeability (PBAT), to improve the properties of polyethylene (PE) such as poor moisture permeability and low gas selective transmission ratio. PE/PBAT film was prepared by tape casting blending method with PE as the main component and PBAT with mass fraction of 10%, 20% and 30%. The thermal properties, mechanical properties, gas permeability and moisture permeability of the film were tested. Then, the film was used to package mini cucumber to study the preservation effect. The addition of PBAT improved the mechanical properties, gas permeability and moisture permeability of PE. Compared with PE, the addition of 30% PBAT increased the permeability coefficient of H2O by 2.42 times. The permeability ratio of CO2/O2 increased from 3.3 to 4.4. During the whole storage process of mini cucumber, the Vc content decreased most slowly, and the sensory quality kept well. Mini cucumber had good commercial value and edible value within 38 days of storage. The addition of PBAT improves the properties of PE and increases the storage time of mini cucumber, which has a better prospect of use.