Strategy to improve PA6 performances by melt compounding

PA6 is widely used for packaging and engineering applications. Literature reports that organically modified nanoclays can improve its flame resistance, thermo-mechanical and gas barrier properties. This study aims at showing a new approach to effectively disperse an unmodified nanoclay (MMT) in PA6 by melt compounding polymeric matrix and clay in the presence of dipentaerythritol (DPE). The prepared composites have been studied in terms of composition and thermal characteristics; moreover, by using a combination of wide and small angle X-ray diffraction data and transmission electron microscopy observations it has been possible to draw the conclusion that a good dispersion of MMT platelets is obtained. The reason has been imputed to probable interactions between DPE, PA6 and clay. On the other hand, the nanoclay can prevent the DPE separation by crystallization. This synergistic effect between DPE and MMT has been observed for balanced amounts of additive and clay. Final properties, in particular barrier properties, are notably enhanced.