3种改性方法对纳米二氧化钛-聚乙烯醇复合膜性能的影响  

Effect of 3 Modification Methods on the Properties of Nano Polyvinyl Alcohol-TiO2 Film

作　　者：徐国斌 岳进[2,3] 王丹凤 高珊[1] 钟宇 赵艳云[4] Xu Guobin;Yue Jin;Wang Danfeng;Gao Shan;Zhong Yu;Zhao Yanyun(Department of Food Science&Technology,Shanghai Jiao Tong University,Shanghai 200240;SJTU-Bor S.Luh Food Safety Center,Shanghai 200240;Key Laboratory of Urban Agriculture,Ministry of Agriculture,Shanghai 200240;SJTU-OSU Innovation Center for Environmental Sustainability and Food Control,Shanghai 200240)

机构地区：[1]上海交通大学食品科学与工程系,上海200240 [2]上海交通大学陆伯勋食品安全研究中心,上海200240 [3]农业部都市农业重点实验室,上海200240 [4]上海交大-俄勒冈州立大学环境可持续与食品质量控制中心,上海200240

出　　处：《中国食品学报》2020年第10期206-213,共8页Journal of Chinese Institute Of Food Science and Technology

基　　金：国家自然科学基金青年科学基金项目(31401537);四川省科技厅重点研发项目(18ZDY0107);上海市科技兴农技术推广项目(2019-2-2-16)。

摘　　要：聚乙烯醇膜可完全降解,耐水性较差。本研究通过添加纳米二氧化钛,并辅以乙酸、尿素、氯化镁3种改性剂,以改善聚乙烯醇膜的耐水性能,并研究膜的机械性能、热力学性能、微观结构以及抑菌性能。结果表明,通过改性,聚乙烯醇膜的耐水性能显著提升,其中氯化镁改性的膜的耐水性最好,相对于PVA膜溶解率下降了73.32%,接触角增加了51.49%。通过SEM和AFM观察膜的微观结构发现纳米粒子分散均匀;添加氯化镁的膜在24 h时,对大肠杆菌的抑菌率达到34.98%,对金黄色葡萄球菌的抑制率达到39.90%。PVA film is fully degradable,but it is weak in water resistance.In this study,nano-TiO2,acetic acid,urea and MgCl2 were added to PVA to improve the film property of water resistance.The mechanical,thermodynamics,microstructure and antibacterial properties of the films were investigated.It was found that the water resistance of the film had been greatly enhanced.The dissolution rate of the PVA-TiO2-MgCl2 film decreased about 73.32%compared to the PVA film,and the contact angle increased about 51.49%.The microstructure was observed by SEM and AFM,and found that the nanoparticles were evenly dispersed in the film.The bacteriostatic rate of the Mg^2+modified film for Escherichia coli and Staphylococcus aureus at the 24 h reached 34.98%,and 39.90%,respectively.

关 键 词：PVA膜 改性剂 耐水性能 微观结构 抑菌率 

分 类 号：TB383.2[一般工业技术—材料科学与工程]