Influence of compatibilizer and processing conditions on the dispersion of nanoclay in a polypropylene matrix

Abstract : Polypropylene/organoclay nanocomposites have been prepared via direct melt intercalation in an internal mixer. Maleic anhydride grafted polypropylene (PP-g-MA) was used as a compatibilizer to improve the dispersability of the clay. The structures of nanocomposites have been characterized by X-ray diffraction, transmission electron microscopy and rheometry in small amplitude oscillatory shear. The effects of concentration of PP-g-MA and processing parameters were investigated. Wide angle X-ray diffraction shows that the interlayer spacing increases with the concentration of PP-g-MA, but is not significantly influenced by processing conditions. The study of linear viscoelastic properties shows that the storage modulus G′ is very sensitive to the microstructure of the nanocomposite. A Carreau-Yasuda law with a yield stress is proposed to describe the rheological behavior of these materials. Applications to the twin screw extrusion process are also presented
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Journal articles
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Wiboon Lertwimolnun, Bruno Vergnes. Influence of compatibilizer and processing conditions on the dispersion of nanoclay in a polypropylene matrix. Polymer, Elsevier, 2005, 46 (10), p. 3462-3471. ⟨10.1016/j.polymer.2005.02.018⟩. ⟨hal-00531180⟩

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