目的 研究柠檬酸添加量对聚乙烯醇薄膜性能的影响。方法 将柠檬酸颗粒溶解到质量分数为10%的PVA母液中， 通过流延法制备柠檬酸/PVA抗菌薄膜。结果 添加柠檬酸可降低薄膜吸水性和溶解性， 随着柠檬酸质量分数的增加， 透湿系数减小。观察扫描电镜表明， 柠檬酸在聚乙烯醇中溶解均匀。以大肠杆菌和金黄色葡萄球菌为指标的抗菌性能测试表明， 柠檬酸对大肠杆菌和金黄色葡萄球菌均有较强的抑制作用。结论 柠檬酸的添加可降低PVA薄膜的吸水性、 溶解性和水蒸气透过系数， 并使薄膜具有抗菌性。

Objective To study the effect of citric acid addition on the properties of polyvinyl alcohol film. Methods Citric acid was dissolved in the PVA mother liquor with a mass fraction of 10%. Citric acid / PVA antimicrobial films were prepared by casting. Results The results showed that addition of citric acid could reduce the water absorption and solubility of PVA film. With the increase of the citric acid proportion, the water vapor permeability of PVA films decreased. Observation of scanning electron microscopy showed that citric acid was evenly dispersed in PVA films. With Escherichia coli and Staphylococcus aureus as indices of the antibacterial properties, the test results showed that the Citric acid-loaded PVA antibacterial films had good antibacterial activity. Conclusion Citric acid addition could reduce the water absorption, solubility and the water vapor permeability of the PVA film, and grant the films with antibacterial properties.