One-step water-assisted melt-compounding of polyamide 6/pristine clay nanocomposites: An efficient way to prevent matrix degradation |
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Authors: | F Touchaleaume J Soulestin M SclavonsMF Lacrampe P Krawczak |
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Institution: | a Univ. Lille Nord de France, F-59000 Lille, France b Ecole des Mines de Douai, Department of Polymers and Composites Technology & Mechanical Engineering, 941 Rue Charles Bourseul, BP 10838, F-59508 Douai, France c Institute of Condensed Matter and Nanoscience (Bio- and Soft- Matter) & Ecole Polytechnique de Louvain, Université Catholique de Louvain, Croix du Sud, 1 1348 Louvain-la-Neuve, Belgium |
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Abstract: | Polyamide 6 (PA6)/clay nanocomposites, based on organo-modified and pristine (i.e. purified but non-modified) montmorillonite, were prepared using a water-assisted extrusion process based on the injection of water during extrusion. The formation of a single PA6/water phase during extrusion (shown by High Pressure Differential Scanning Calorimetry (HPDSC)) improves the clay dispersion, decreases the PA6 melting temperature by 66 °C (so-called cryoscopic effect), and thus prevents the polymer matrix degradation during processing. This process enables the compounding of pristine clay-based nanocomposites whose dispersion state, thermal and mechanical performances are close to what is generally reported for organo-modified montmorillonite-based nanocomposites. Advantage was taken of water-assisted extrusion to optimize the clay dispersion by increasing shear rate and of the cryoscopic effect to limit the degradation by decreasing the processing temperature. Using these conditions PA6/pristine clay nanocomposites properties are similar to those of more conventional PA6/organomodified clay nanocomposites. |
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Keywords: | Polyamide Nanocomposites Pristine clay Water-assisted extrusion Degradation |
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