Dynamic rheological characterization of polyamide/modified polyolefin laminates

In this work dynamic rheological and peel strength measurements on laminate s of polyamide and several modified polyolefins were made to evaluate the i nterfacial compatibilization phenomena. The polyolefins used were a low-den sity polyethylene, without any treatment and gamma-ray irradiated in air, a nd two copolymers, an ethylene-tert-butyl acrylate-acrylic acid terpolymer and a partially neutralized ethylene-methacrylic acid copolymer containing sodium cations. Multilayer structures containing different amounts of both interfacial surface and volume fraction were studied. Relationships between viscoelastic functions and composition were used to analyze the effect of bulk and surface modification in the polyolefins at the interface with the polyamide. The results show that dynamic rheological measurements of strati fied polymers can be used as a tool to investigate interfacial activity in multiphase systems.