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Design, structuration and rheological properties of Laponite based polymeric nanocomposites

Abstract : This study concerns model nanocomposites based on Laponite and polyethylene oxide, alone or blended with polymethylmethacrylate. We studied the influence of the parameters on rheological properties of model PEO/Laponite nanocomposites such as matrix molecular weight, preparation method. The best dispersion state of the particles is obtained from solution. Melt dispersion leads to a low frequency modulus which depends on the length and grafting density of the particles. Heterogeneous materials are obtained from melt dispersion of a master batch. PMMA/PEO blends appear to be homogeneous at room temperature only for PEO concentration less than 30wt%. Laponite particles are concentrated in small domains where most of PEO has been extracted. At higher concentrations of PEO, a continuous phase containing PEO and Laponite above percolation concentration is observed, leading to an elastic modulus at low frequency. The presence of Laponite decreases significantly the crystallinity of PEO.
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Omar Abakar Adam. Design, structuration and rheological properties of Laponite based polymeric nanocomposites. Other. Université du Maine, 2012. English. ⟨NNT : 2012LEMA1014⟩. ⟨tel-00756711⟩

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