目的 探索功能配合物MOF-199对聚乳酸（PLA）的改性作用以及MOF-199添加量对PLA薄膜性能的影响。方法 采用溶液共混流延的方式将MOF-199与PLA复合制备复合薄膜，采用扫描电子显微镜（SEM）、红外光谱（IR）研究复合薄膜的表面形貌和组分，通过测试复合薄膜的色差、透光率、雾度、力学性能、水蒸气透过率及紫外可见吸收光谱等，研究MOF-199含量对复合薄膜性能的影响。结果 随着MOF-199添加比例的增大，复合薄膜的水蒸气透过率先升高后降低，最大值为1.186×10–13 g•cm/(m2•s•Pa)，各复合薄膜的透光率均在91%以上，最大断裂伸长率基本在2.1%~2.5%之间，拉伸强度降低，紫外吸收能力逐渐增大。与纯PLA薄膜相比，当MOF-199的质量分数为5.0%时，复合薄膜在210 nm处的紫外吸光度提高了约1.6倍。结论 配合物MOF-199的加入可提高PLA复合薄膜的抗紫外性能和水蒸气透过性能，制备的复合薄膜在抗紫外及气调包装领域具有潜在应用价值。

The work aims to explore the functional modifications of poly (lactic acid) (PLA) through the incorporation of complex MOF-199 and study the effect of MOF-199 with different concentrations on the properties of PLA films. MOF-199/PLA composite films were prepared by solution blending and film casting method. The surface morphology and chemical structure of the composite films were characterized by scanning electron microscope (SEM) and flourier trans-formation infrared spectroscopy (IR) spectrum. The color difference test, transmittance/haze test, mechanical measurement, water vapor permeability test and ultraviolet-visible spectrum were performed to evaluate the influence of different MOF-199 contents on properties of the composite films. With the increase of MOF-199 concentration, the water vapor permeability of the composite films increased to 1.186×10–13 g•cm/(m2•s•Pa) and then decreased. The tensile strength decreased and the transmittance of the films slightly decreased to 91%, and the maximum elongation at break of the films was kept in the range of 2.1%-2.5%. The incorporation of MOF-199 enhanced the UV absorption property of PLA. Compared with the pure PLA film, the UV absorbance at 210 nm was improved by almost 1.6 times when the amount of MOF-199 was reached to 5.0%. Therefore, the addition of MOF-199 can improve the UV shielding property and water vapor permeability of the prepared MOF-199/PLA composite films. It is proposed that the prepared composite films may have the potential applications in anti-ultraviolet or modified atmosphere packaging.