Micromechanical modeling and characterization of the effective properties in starch-based nano-biocomposites.
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.
Chivrac
Frederic
F
ECPM-LIPHT, University Louis Pasteur, 25 rue Becquerel 67087, Strasbourg, France.
Gueguen
Olivier
O
Pollet
Eric
E
Ahzi
Said
S
Makradi
Ahmed
A
Averous
Luc
L
D000538:Aluminum Silicates; D001546:Bentonite / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D000077215:Clay; D046529:Microscopy, Electron, Transmission; D015233:Models, Statistical; D008962:Models, Theoretical; D008968:Molecular Conformation; D053761:Nanocomposites / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D010968:Plasticizers; D013213:Starch; D013314:Stress, Mechanical; D014908:Triticum / Q000378:metabolism; D014961:X-Ray Diffraction
D000538:Aluminum Silicates; D001672:Biocompatible Materials; D010968:Plasticizers; D001546:Bentonite; D013213:Starch; D000077215:Clay