A resin composition comprising melt blending a polyamide resin such as nylon MXD6 with a polyphenoxy resin. The polyamide resin and the polyphenoxy resin may be combined prior to or after melting and can be sandwiched between two PET layers in a perform mold to form an article capable of blow molding to form a container with improved delamination resistance. Also, intercalated layered materials are prepared by co-intercalation of an onium ion, an aromatic polyamide oligomer or polymer, e.g., nylon MXD6, and a polyphenoxy oligomer or polymer between the planar layers of a swellable layered material, such as a phyllosilicate, preferably a smectite clay. The co-intercalated layered materials are combined with the aromatic polyamide and polyphenoxy resin to form a nanocomposite composition for sandwiching between PET layers to form containers having improved delamination resistance.