食品科学

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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

刘桂超,龙 门,宋 野,刘 瑶,李 璨,章建浩*   

  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
  • 出版日期:2014-07-25 发布日期:2014-08-26
  • 通讯作者: 章建浩
  • 基金资助:

    “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)

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

LIU Gui-chao, LONG Men, SONG Ye, LIU Yao, LI Can, ZHANG Jian-hao*   

  1. National Center of Meat Quality and Safety Control, Key Laboratory of Food Processing and Quality Control,
    Ministry of Agriculture, Synergetic Innovation Center of Food Safety and Nutrition,
    College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Online:2014-07-25 Published:2014-08-26
  • Contact: ZHANG Jian-hao

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。

关键词: 聚乙烯醇, 纳米复合膜, 纳米蒙脱土, 包装性能

Abstract:

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.

Key words: polyvinyl alcohol (PVA), nanocomposite films, nano-montmorillonite (nano-MMT), packaging properties

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