Journal
ACTA BIOMATERIALIA
Volume 4, Issue 6, Pages 1707-1714Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2008.05.002
Keywords
Micromechanical modeling; Nano-biocomposites; Nanoclay dispersion; Starch; Exfoliation
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The aim of this work was to predict the effective elastic properties of starch-based nano-biocomposites. Experiments (materials elaboration, morphological characterization and determination of mechanical properties) were conducted on both the pristine matrix (plasticized starch) and the matrix filled with montmorillonite nanoclay. Aggregated/intercalated and exfoliated nano-biocomposites were produced and mechanically tested under uniaxial tension to understand the effect of montmorillonite morphology/dispersion on the stiffness properties of starch-based nano-biocomposites. Micromechanical models, based on the classical bounds and the Mori-Tanaka approaches, were developed taking into consideration the influence of the clay concentration, the exfoliation ratio, the relative humidity and the storage time (ageing). Predicted results are in a good agreement with our experiments and show that the micromechanical model can be used as an indirect characterization technique to quantify the exfoliation/aggregation degree in the plasticized starch/clay nano-biocomposites. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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