Print version ISSN 1516-1439
PAZ, Rene Anisio et al. Evaluation of impact strength of polyamide 6/bentonite clay nanocomposites. Mat. Res. [online]. 2012, vol.15, n.4, pp.506-509. Epub June 26, 2012. ISSN 1516-1439. http://dx.doi.org/10.1590/S1516-14392012005000066.
Nanocomposites of polymer/clay have had much attention in recent years, particularly those developed with layered silicates due to the need of engineering materials more efficient than pure polymers for certain applications. The level of exfoliation of layered silicates in crystalline structure of polymer matrices has been studied and has been observed that it affects the crystalline behavior and the physical and mechanical properties. In this study, nanocomposites of polyamide 6 were obtained by the melt intercalation method, using a Brazilian bentonite modified with a quaternary ammonium salt. X-Ray Diffraction (XRD) results showed the incorporation of salt among the layers of clay, making it organophilic and that the nanocomposites presented exfoliated and/or partially exfoliated structures and confirmed by transmission electron microscopy (TEM). By thermogravimetry (TG), the results indicated that the presence of clay increased the thermal stability of polyamide 6. The impact properties of the nanocomposites showed inferior values in relation to the pure polyamide, in other words, decrease the toughness.
Keywords : nanocomposites; organoclay; polyamide 6.