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Effets de synergies entre montmorillonites organophiles (OMMT) et graphène dans les nanocomposites à base de polymères biodégradables

Abstract : The work carried out during this thesis highlights the effect of different kinds of organophilic clays OMMT (Cloisite®15A and Cloisite®30B) and/or epoxy functionalized graphene (Gr) on the functional properties of biodegradable polylactic acid (PLA), poly (ε-caprolactone) (PCL) and their mixture PLA/PCL (70/30 mass%). The first part is devoted to study the binary mixtures (PLA/Cloisite® and PLA/Gr) and ternary materials (PLA/Cloisite®/Gr) prepared via melt blending method. The combination of the two fillers (OMMT and Gr) improves all the rheological parameters of the PLA matrix and contributes to the appearance of a pseudo-solid viscoelastic behavior for PLA/Gr composites in the presence of clays, attributed to the better dispersion confirmed by transmission electron microscopy. The water vapor permeability, thermal and thermomechanical properties of PLA have been significantly improved, especially in the presence of hybrids OMMT/Gr and show the great interest of PLA/Cloisite®/Gr ternary nanobiocomposites in several applications. The second part is related to nanocomposite materials based on the biodegradable PCL matrix. The rheological study confirms the advantage of combining the organomodified clays and graphene nanofillers, and indicates the presence of tridimensional networks in the binary nanocomposites PCL/OMMT and PCL/OMMT/Gr. The good state of dispersion of the hybrids nanofillers (OMMT + Gr) has considerably improved the water vapor permeability and the thermal resistance of the PCL matrix. The dispersability of the nanofillers and their effect on the miscibility were the subject of the last part devoted to the PLA/PCL immiscible blend. Very interesting viscoelastic properties were obtained after the incorporation of the OMMT/Gr mixtures, indicating the existence of good level of distribution of nanofillers in the PLA/PCL matrix. The synergy between the OMMT and epoxy functionalized graphene led to the best improvement in term of barrier properties, thermal stability and compatibility of the matrix.
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Boubkeur Seddik Bouakaz. Effets de synergies entre montmorillonites organophiles (OMMT) et graphène dans les nanocomposites à base de polymères biodégradables. Matériaux. Université de Bretagne Sud; Université Abderrahmane Mira - Bejaïa (Bejaïa, Algérie), 2017. Français. ⟨NNT : 2017LORIS430⟩. ⟨tel-01525847⟩

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