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Chitosan/clay nanocomposite film preparation and characterization

Authors

  • Yixiang Xu,

    1. Industrial Agricultural Products Center and Department of Food Science & Technology, University of Nebraska, Lincoln, Nebraska 68583-0730
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  • Xi Ren,

    1. Department of Engineering Mechanics, University of Nebraska, Lincoln, Nebraska 68588-0526
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  • Milford A. Hanna

    Corresponding author
    1. Industrial Agricultural Products Center and Department of Food Science & Technology, University of Nebraska, Lincoln, Nebraska 68583-0730
    • Industrial Agricultural Products Center and Department of Food Science & Technology, University of Nebraska, Lincoln, Nebraska 68583-0730
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Abstract

Nanocomposites of chitosan and nanoclays (MMT-Na+ and Cloisite 30B) were prepared by solvent casting. The structural properties, thermal behaviors, and mechanical properties were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy, differential scanning calorimetry, thermogravimetry analyses, and an Instron universal testing machine. XRD and TEM results indicated that an exfoliated structure was formed with addition of small amounts of MMT-Na+ to the chitosan matrix. Intercalation along with some exfoliation occurred with up to 5 wt % MMT-Na+. Micro-scale composite (tactoids) formed when Cloisite 30B was added to the chitosan matrix. Surface roughness increased with addition of a small amount of clay. Tensile strength of a chitosan film was enhanced and elongation-at-break decreased with addition of clay into the chitosan matrix. Melt behavior and thermal stability did not change significantly with addition of clays. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1684–1691, 2006

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