Oxygen Barrier and Blending Properties of Blown Films of Blends of Modified Polyamide and Polyamide-6 Clay Mineral Nanocomposites

摘要

Investigations of oxygen barrier and blending properties of the modified polyamide (MPA) and nylon-6 clay (NYC) blends (MPANYC) were systematically investigated. After blending NYC in MPA, the oxygen barrier properties of the MPANYC film specimens are significantly better than those of the MPA and NYC film specimens. At 20 wt% optimum content of NYC, the oxygen barrier improvement of MPANYC film specimen reach the maximum, which is in the same order of magnitude of barrier improvement as those of PVDC film specimens. Similar NYC content dependence was found on the plots of free volume properties (i.e. Rf, Vf, I3 and Fv) vs. the NYC contents of MPANYC specimens. The minimum Rf, Vf, I3 and Fv values of MPANYC specimens were found as their NYC contents reach about 20 wt%. The characteristic X-ray reflections of α form PA crystals originally associated with the MPA resin almost disappear after blending varying amounts of NYC in MPA resins. These improved oxygen barrier properties of the MPANYC film specimens were explained in terms of the reduced free volume properties and demarcated structures of the elongated and overlapped clay mineral layers caused by the presence of the nanometer clay mineral layers.