Micromechanically-based formulation of the cooperative model for the yield behavior of starch-based nano-biocomposites

F. Chivrac, O. Gueguen, E. Pollet, L. Averous, Said Ahzi, S. Belouettar

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The tensile yield stress of plasticized starch filled with montmorillonite has been studied as a function of the temperature and the strain rate and has been compared to the yield behavior of the original matrix. Aggregated/ intercalated and exfoliated nano-biocomposites, obtained from different nanofillers, have been produced and tested under uniaxial tension (tensile test). To model the nanocomposite tensile yield stress behavior, a preexisting micro-mechanically based cooperative model, which describes properly the yield of semi-crystalline polymers has been modified. According to our development, the yield behavior of nano-biocomposites is strongly dependant on the clay concentration and exfoliation ratio. Based on the thermodynamics properties, an effective activation volume and effective activation energy are computed through the Takayanagi homogenization model. The predicted results for the yield stress at low strain rates and at different temperatures are in agreement with our experimental results.

Original languageEnglish
Pages (from-to)2949-2955
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number4
DOIs
Publication statusPublished - Apr 2010
Externally publishedYes

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Keywords

  • Cooperative model
  • Micromechanical modeling
  • Nano-Biocomposites
  • Starch
  • Yield behavior

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

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