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Alliages de thermoplastiques immiscibles Polyéthylène/Polyamide chargés de nanoparticules d'argile : relations structure – morphologie – rhéologie

Abstract : The originality of this study is to compare structural, morphological and rheological characteristics of two ternary blends having a nodular morphology: the first one, a polyethylene (PE) matrix blend and the other one, a polyamide (PA) matrix blend. The organoclay used is a modified montmorillonite (C30B) having a good affinity towards PA.
One of the main results of this study is the drastic nodules size reduction by adding small fractions of organoclay. Mechanisms, responsible of this size reduction, depend on clay location. Clay localized at the interface favours the formation of an interphase. In this case, the nodule size reduction is attributed to the coalescence suppression (internodular steric repulsion) combined with the decrease of interfacial tension. The dispersion of clay in the matrix generates an increase of the viscosity, favouring the mechanism of rupture of nodules. Moreover, the nodule size reduction is amplified by suppressing coalescence due to the dispersion of clay in the matrix.
The linear viscoelastic properties are discussed in relation to structure and morphology. The rheological behaviour of PE matrix blends is closed to that of the PE/PA neat blend. On the other hand, PA matrix blend behaviour is comparable to that of PA/C30B nanocomposites.
At low clay fractions, we also showed that the use of a PA/C30B masterbatch for the preparation of samples improves the level of intercalation and exfoliation degree of clay, so modifying mechanisms responsible of nodule size reduction.
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Submitted on : Sunday, June 21, 2009 - 3:53:03 PM
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Julien Ville. Alliages de thermoplastiques immiscibles Polyéthylène/Polyamide chargés de nanoparticules d'argile : relations structure – morphologie – rhéologie. Sciences de l'ingénieur [physics]. Université de Bretagne occidentale - Brest, 2009. Français. ⟨tel-00397353⟩

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