Elaboration and properties of plasticised chitosan-based exfoliated nano-biocomposites

POLYMER

卷:54

Article

Xie, David Fengwei¹  Martino, Veronica P.²  Sangwan, Parveen³  Way, Cameron³  Cash, Gregory A.⁴  Pollet, Eric²  Dean, Katherine M.³  Halley, Peter J.^1,4  Averous, Luc² 

[1] Univ Queensland, Australian Inst Bioengn & Nanotechnol, Brisbane, Qld 4072, Australia

[2] Univ Strasbourg, BioTeam ICPEES ECPM, UMR 7515, F-67087 Strasbourg 2, France

[3] CSIRO Mat Sci & Engn, Clayton, Vic 3168, Australia

[4] Univ Queensland, Sch Chem Engn, Brisbane, Qld 4072, Australia

关键词: Chitosan;    Nano-biocomposite;    Montmorillonite;   

DOI  :  10.1016/j.polymer.2013.05.017

来源: Elsevier

【 摘 要 】

A series of plasticised chitosan-based materials and nanocomposites were successfully prepared by thermomechanical kneading. During the processing, the montmorillonite (MMT) platelets were fully delaminated. The nanoclay type and content and the preparation method were seen to have an impact on the crystallinity, morphology, glass transition temperature, and mechanical properties of the samples. When higher content (5%) of MMT-Na+ or either content (2.5% or 5%) of chitosan-organomodified MMT (OMMT-Ch) was used, increases in crystallinity and glass transition temperature were observed. Compared to the neat chitosan, the plasticised chitosan-based nano-biocomposites showed drastically improved mechanical properties, which can be ascribed to the excellent dispersion and exfoliation of nanoclay and the strong affinity between the nanoclay and the chitosan matrix. The best mechanical properties obtained were Young's modulus of 164.3 MPa, tensile strength of 13.9 MPa, elongation at break of 62.1%, and energy at break of 0.671 MPa. While the degree of biodegradation was obviously increased by the presence of glycerol, a further increase might be observed especially by the addition of unmodified nanoclay. This could surprisingly contribute to full (100%) biodegradation after 160 days despite the well-known antimicrobial property of chitosan. The results in this study demonstrate the great potential of plasticised chitosan-based nano-biocomposites in applications such as e.g., biodegradable packaging materials. (C) 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

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