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Preparation and Gas Barrier Properties of Chitosan/Clay Nanocomposite Film  

Nam Sang Yong (Department of Polymer Science and Engineering, Engineering Research Institute, Gyeongsang National University)
Park Ji Soon (Department of Polymer Science and Engineering, Engineering Research Institute, Gyeongsang National University)
Rhim Ji Won (Department of Chemical Engineering, Hannam University)
Park Byung Gil (School of Chemical Engineering, College of Engineering, Hanyang University)
Kong Sung-Ho (School of Chemical Engineering, College of Engineering, Hanyang University)
Publication Information
Membrane Journal / v.15, no.3, 2005 , pp. 247-254 More about this Journal
Abstract
Chitosan film has potential applications in agriculture, food, and pharmacy. However, films made only from chitosan lack gas barrier and have poor mechanical properties. For enhanced gas barrier and mechanical properties, chitosan/clay nanocomposites have been prepared with montmorillonite (MMT) which is a layered structure of clays and chitosan. The cationic biopolymer, chitosan is intercalated into $Na^+-montmorillonite$ through cationic exchange and hydrogen bonding process. Diluted acetic acid is used as solvent f3r dissolving and dispersing chitosan. Chitosan was intercalated or exfoliated in MMT and it was confirmed by X-ray diffraction method. D-spacing of the characteristic peak from MMT plate in chitosan/clay nanocomposites was moved and diminished. The thermal stability and the mechanical properties of the nanocomposites are measured by TGA and Universal Testing Machine. Gas permeability through the chitosan/clay nanocomposites films decreased due to increased tortuosity made by intercalation of clay in chitosan.
Keywords
nanocomposites; chitosan; clay; intercalation; exfoilation; MMT; mechanical property; thermal property;
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