目的 对纳米二氧化锰(nano-MnO2)壳聚糖(CS)复合膜的结构和性能进行分析，为可生物降解包装材料制备提供参考。方法 以KMnO4和MnSO4为原料，采用水热法制备nano-MnO2，将其与壳聚糖的乙酸溶液在超声条件下混合，加入甘油制备nano-MnO2-CS复合膜。考察不同nano-MnO2添加量对nano-MnO2-CS复合膜拉伸强度、断裂伸长率、阻氧阻水性能、透光率和抑菌性的影响，利用红外光谱、X衍射光谱和偏光显微镜对其结构进行分析表征，通过热重分析其热稳定性。结果nano-MnO2与壳聚糖之间存在较强的分子间相互作用力，均匀地分散在其中;当nano-MnO2与CS的质量比为1∶5时，nano-MnO2-CS复合膜具有较强的阻水、阻氧、光阻隔性能，以及良好的柔性、热稳定性和抑菌性。结论 制备的nano-MnO2-CS复合膜力学性能和阻隔性能均得到提高，热稳定性增强，具有一定的抑菌作用。

The structure and properties of nano-MnO2 chitosan composite film were analyzed to provide reference for the preparation of biodegradable packaging materials. The KMnO4 was combined with MnSO4 to form nanometer manganese dioxide (nano-MnO2) by hydrothermal. Then, nano-MnO2-CS composite film was successfully prepared through CS and nano-MnO2 in a mixed solution of acetic acid and glycerin under ultrasonic wave. The properties of the composite film, such as tensile strength, elongation at break, oxygen and water resistance, light transmittance and antibacterial property were investigated. The structure was characterized by Fourier transform infrared spectroscopy, X-ray powder diffractometer and the digital polarizing microscope. The thermostability was studied by thermogravimetric analysis. The nano-MnO2 was uniformly dispersed in the chitosan and they were connected to each other by strong intermolecular forces. When the mass ratio of nano-MnO2∶CS is 1∶5, nano-MnO2-CS composite membrane has excellent oxygen and water resistance, strong light barrier performance, good flexibility, thermal stability and antibacterial property. Therefore, the prepared nano-MnO2-CS composite film has improved mechanical properties and barrier properties, enhanced thermal stability, and has a certain antibacterial effect.