Enhancement of the Wet Properties of Transparent Chitosan-Acetic-Acid-Salt Films Using Microfibrillated Cellulose

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• 作者：David Nordqvist ; Johan Idermark ; Mikael S. Hedenqvist ; Mikael Gä ; llstedt ; Mikael Ankerfors ; Tom Lindströ ; m
• 刊名：Biomacromolecules
• 出版年：2007
• 出版时间：August 2007
• 年：2007
• 卷：8
• 期：8
• 页码：2398 - 2403
• 全文大小：868K
• 年卷期：v.8,no.8(August 2007)
• ISSN：1526-4602

文摘

This report presents a new route to enhance the wet properties of chitosan-acetic-acid-salt films usingmicrofibrillated cellulose (MFC). The enhancement makes it easier to form chitosan-acetic-acid-salt films intovarious shapes at room temperature in the wet state. Chitosan with MFC was compared with the well-knownbuffer treatment. It was observed that films containing 5 wt % MFC were visually identical to the buffered/unbuffered films without MFC. Field-emission scanning electron microscopy indicated that MFC formed a networkwith uniformly distributed fibrils and fibril bundles in the chitosan matrix. The addition of MFC reduced the riskof creases and deformation in the wet state because of a greater wet stiffness. The wet films containing MFCwere also extensible. Although the stiffness, strength and extensibility were highest for the buffered films, thewet strength of the MFC-containing unbuffered films was sufficient for wet forming operations. The effects ofMFC on the mechanical properties of the dry chitosan films were small or absent. It was concluded that theaddition of MFC is an acceptable alternative to buffering for shaping chitosan films/products in the wet state.The advantages are that the "extra" processing step associated with buffering is unnecessary and that the filmmatrix remains more water-soluble.