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Interphase vs confinement in starch-clay bionanocomposites

Abstract : Starch-clay bionanocomposites containing 1–10% of natural montmorillonite were elaborated by melt processing in the presence of water. A complex macromolecular dynamics behavior was observed: depending on the clay content, an increase of the glass transition temperature and/or the presence of two overlapped α relaxation peaks were detected. Thanks to a model allowing the prediction of the average interparticle distance, and its comparison with the average size of starch macromolecules, it was possible to associate these phenomena to different populations of macromolecules. In particular, it seems that for high clay content (10%), the slowdown of segmental relaxation due to confinement of the starch macromolecules between the clay tactoïds is the predominant phenomenon. While for lower clay contents (3–5%), a significant modification of chain relaxation seems to occur, due to the formation of an interphase by the starch macromolecules in the vicinity of clay nanoparticles coexisting with the bulk polymer.
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Submitted on : Tuesday, April 21, 2020 - 9:38:47 AM
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Gildas Coativy, Chloé Chevigny, Agnès Rolland-Sabaté, Eric Leroy, Denis Lourdin. Interphase vs confinement in starch-clay bionanocomposites. Carbohydrate Polymers, Elsevier, 2015, 117, pp.746-752. ⟨10.1016/j.carbpol.2014.10.052⟩. ⟨hal-02548929⟩



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