Desenvolvimento e caracterização de nanocompósitos de blendas de PA6/AES compatibilizadas com copolímero acrílico
Oliveira, Amanda Dantas de
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Toughened polyamide 6 (PA6) nanocomposites were obtained by incorporation of acrylonitrile-EPDM-styrene (AES). As compatibilizing agents was used the copolymer methyl methacrylate-anhydride (MMA-MA). The effect of the blending protocol of the components and of the addition of three montmorillonites (Cloisite®30B, Cloisite®20A and Cloisite®Na+) was investigated. The nanocomposites were prepared in a twin screw extruder and then its microstructure, lamellar structure, mechanical, thermal and rheological properties were characterized. The morphology and properties of the nanocomposites were significantly affected by different nanoclays and blending protocol. The characterizations by transmission electron microscopy (TEM), small angle X-ray scattering (SAXS) and wide angle X-ray difraction (WAXD) indicated intercalated structures for the nanocomposites with Cloisite®20A and Cloisite®Na+, in contrast to the ones prepared with Cloisite®30B that exhibited exfoliated structure. The addition of nanoclays in the blends increased the modulus for all nanocomposites with respect to the pure blend. Excellent impact strength results were obtained for the nanocomposites compatibilized with MMA-MA with respect to the blend PA6/AES and ternary systems ternary (PA6/AES/clay), demonstrating the effective presence of the copolymer as a compatibilizer of these systems. It was observed a good correlation between mechanical properties and morphology. An increase in rigidity is accompanied by a corresponding increase in toughness when the clay is present in both phases. A significant increase in long period of nanocomposites compared to the PA6 was observed through SAXS results. In this work, polymer blends compatibilized with MMA-MA were also prepared and a significant increases in the mechanical behavior these materials was observed.