In this study, polyvinyl alcohol (PVA) was used as a film-forming substrate, added to extracted tea polyphenols (TPs) in various ratios and processed with ultrasonication to form films using the tape-casting method. The effects of ultrasonic processing duration on the properties of PVA/TP antibacterial active materials were explored via material property testing. The results showed that, overall, ultrasonic processing degraded the tensile strength and elongation at break of the composite films. When PVA/TP composite films with a PVA-to-TP mass ratio of 8:2 were processed with ultrasonication for 30 min, the swelling capacity was (740.19 ± 64.67)% and solubility was (5.26 ± 1.31)%. Ultrasonication also improved the degradability and barrier properties of composite films. Moreover, 8/2 composite films with the PVA/TP ratio of 8:2 exhibited excellent bacteriostatic properties; after ultrasonication processing, the films had a bacteriostatic rate of (95.5 ± 4.2)% and (91.8 ± 3.7)% against Staphylococcus aureus and Escherichia coli, respectively, making them suitable for use as antibacterial active materials in food packaging.

在这项研究中，聚乙烯醇（PVA）被用作成膜基质，以各种比例添加到提取的茶多酚（TPs）中，并通过流延法超声处理成膜。通过材料性能测试，探讨了超声处理时间对PVA / TP抗菌活性材料性能的影响。结果表明，总体上，超声处理降低了复合膜的拉伸强度和断裂伸长率。当将PVA与TP的质量比为8：2的PVA / TP复合膜用超声处理30分钟时，溶胀能力为（740.19±64.67）％，溶解度为（5.26±1.31）％。超声处理还改善了复合膜的降解性和阻隔性能。此外，PVA / TP比为8的8/2复合膜：2表现出优异的抑菌性能；经过超声处理后，薄膜的抑菌率分别为（95.5±4.2）％和（91.8±3.7）％金黄色葡萄球菌和大肠杆菌分别使其适合用作食品包装中的抗菌活性物质。