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Interphase vs confinement in starch-clay bionanocomposites.

Gildas Coativy1, Chloé Chevigny2, Agnès Rolland-Sabaté2

  • 1LUNAM Université, CNRS, GEPEA, UMR 6144, CRTT, 37, Boulevard de l'Université, 44606 St Nazaire Cedex, France; UR1268 Biopolymères Interactions Assemblages, INRA, F-44300 Nantes, France; Structure Fédérative IBSM, INRA Nantes-Angers, Rue de la Géraudière, BP 71627, 44316 Nantes Cedex 3. France.

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Summary

This study explores starch-clay bionanocomposites, revealing how montmorillonite clay affects starch macromolecule dynamics. Different clay concentrations influence glass transition and relaxation behaviors, indicating varied macromolecule interactions.

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ClayConfinementMacromolecular dynamicsNanocompositeStarch

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Starch-clay bionanocomposites offer sustainable material alternatives.
  • Understanding macromolecular dynamics is crucial for material property optimization.
  • Natural montmorillonite clay is a promising nanofiller for biopolymer composites.

Purpose of the Study:

  • To investigate the effect of montmorillonite content on the macromolecular dynamics of starch-clay bionanocomposites.
  • To correlate observed dynamic behaviors with clay concentration and macromolecular confinement.
  • To elucidate the role of interphase formation in composite properties.

Main Methods:

  • Melt processing of starch-clay bionanocomposites with varying montmorillonite content (1-10%).
  • Analysis of macromolecular dynamics using techniques sensitive to glass transition and relaxation phenomena.
  • Application of a predictive model for average interparticle distance to analyze macromolecule behavior.

Main Results:

  • An increase in glass transition temperature and the emergence of two overlapped alpha relaxation peaks were observed with increasing clay content.
  • Macromolecular dynamics were linked to different populations of starch macromolecules based on clay concentration.
  • At high clay content (10%), segmental relaxation slowdown due to confinement was predominant.
  • At lower clay contents (3-5%), interphase formation and modified chain relaxation were observed.

Conclusions:

  • Starch-clay bionanocomposite properties are significantly influenced by montmorillonite content and resulting macromolecular dynamics.
  • Confinement and interphase formation play distinct roles in modifying starch macromolecule behavior at different clay loadings.
  • These findings provide insights into tailoring bionanocomposite properties through controlled filler interactions.