Ce^(4+)/纳米ZnO涂布PE薄膜的包装性能研究

Study on packaging property of PE film coated Ce^(4+)/nano-ZnO

制备Ce^(4+)/纳米ZnO粉体,分散至PVA溶胶中,采用涂布法制备Ce^(4+)/纳米ZnOPE复合薄膜。利用透射电镜表征Ce^(4+)/纳米ZnO粒子的微观结构变化;利用电子万能试验机、透氧测试仪、透湿测试仪和贴膜法分析复合薄膜的力学、阻隔和抗菌性能,并考察其对樱桃的保鲜效果。结果表明,该复合薄膜在纳米粉体含量为1.5%时可获得良好的力学性能;纳米粉体含量0~2%时阻隔性能持续上升;纳米粉体含量为1%时,复合薄膜避光、自然光和紫外光条件下的抗菌率分别达94%,98%和99%以上;复合薄膜用于樱桃包装保鲜实用效果较佳。

This study prepared Ce4＋/nano-ZnO powder, dispersed into PVA Sol and to make Ce4＋/nano-ZnO PE composite film by coating method. Using TEM characterizes the surface structure and property changes of Ce4＋/nano-ZnO. Analyzed the film＇s mechanic, barrier and antimicrobial properties by using Electronic univer- sal testing machine, Oxygen permeability tester, Water vapor permeability tester and Foil method, and re- searched its preservation properties for cherry. Results showed that the film can get good mechanical properties when content of the nano-powder is around 1.5 %. The barrier properties rise continually when content of nano- powder between 0 2%.The antibacterial rate is over 94% in protected from light, 98% in natural light and 99% in UV when content of the nano-powder is 1%. The preservation effect of film is good when used for cherry packaging.