纳米蒙脱土含量对聚乙烯醇基纳米复合膜包装性能的影响  

Effect of Nano-Montmorillonite Contents on Packaging Properties of Polyvinyl Alcohol-Based Nanocomposite Films

作　　者：刘桂超[1] 龙门[1] 宋野[1] 刘瑶[1] 李璨[1] 章建浩[1] 

机构地区：[1]国家肉品质量安全控制工程技术研究中心 农业部农畜产品加工与质量控制重点开放实验室 食品安全与营养协同创新中心 南京农业大学食品科技学院,江苏南京210095

出　　处：《食品科学》2014年第14期216-222,共7页Food Science

基　　金：“十二五”国家科技支撑计划项目(2012BAD28B01);苏州市科技计划项目(ZXG2012033);常熟市人才计划项目(CSRC1131)

摘　　要：以聚乙烯醇(polyvinyl alcohol,PVA)和纳米钠基蒙脱土(montmorillonite,MMT)为原料,通过溶液插层-流延成膜法制备不同MMT含量(0、2.5%、5%、10%、15%、20%,以PVA干质量计)的PVA-MMT纳米复合膜,研究纳米MMT含量对聚乙烯醇基纳米复合膜包装性能的影响。X射线衍射图谱及扫描电镜结果表明,低含量(5%以下)MMT在纳米复合膜内分散均匀,形成剥离型纳米复合材料,其他含量则形成插层型的纳米复合材料,PVA结晶形态受纳米材料含量的影响。纳米复合膜的包装性能受纳米MMT含量的影响,随着纳米MMT含量的升高,PVA-MMT纳米复合膜的水蒸气阻隔性能(水蒸气透过率)和耐水性能(溶解质量损失率、溶胀率和吸湿率)显著提高(P<0.05),而透光性能显著降低(P<0.05);在0~5%MMT含量范围内,纳米复合膜拉伸强度随着纳米MMT含量的增加而提升,而纳米MMT含量高于5%之后,纳米复合膜拉伸强度低于纯PVA膜的拉伸强度,并且加入纳米材料后,复合膜韧性降低。Polyvinyl alcohol(PVA)-based nanocomposite films with different amounts of nano-montmorillonite(MMT)(0,2.5,5,10,15,and 20 g MMT/100 g PVA) were fabricated by a solution-intercalation,film-casting method,and the effects of MMT contents were evaluated on film packaging properties. Results of X-ray diffraction(XRD) and scanning electron microscopy(SEM) revealed exfoliated nanocomposite films at low level(2.5% and 5%),but intercalated nanocomposite films at high content(more than 10%) of nano-MMT addition,and their crystalline behavior and packaging properties were greatly influenced by MMT content. With increasing nano-MMT content,water vapor permeability and water resistance of films increased,but transparency property decreased. Tensile strength increased with increasing MMT content up to 5%,and decreased with more than 10% of MMT incorporation,and nanocomposite films became brittle after addition of MMT.

关 键 词：聚乙烯醇 纳米复合膜 纳米蒙脱土 包装性能 

分 类 号：TB383.1[一般工业技术—材料科学与工程]