▎ 摘　　要

Polypropylene (PP) and polyamide-6 (PA6) nanocomposites containing thermally reduced graphene oxide (TRGO), obtained either at 600 degrees C (TRGO(600)) or 800 degrees C (TRGO(800)), were prepared by melt mixing in order to study the effect of the thermal treatments on their barrier and mechanical properties. Transmission electron microscopy images of nanocomposites showed a relative good dispersion of TRGO in polymer matrices with some agglomerations. Differential scanning calorimetry analyses showed a slight reduction in crystallinity for both polymers in the presence of TRGO. The permeability to oxygen and water vapor was decreased in almost all nanocomposites due to a more tortuous path to gas permeation, being more evident for PP/TRGO(800). Tensile stress-strain tests showed that all nanocomposites had higher elastic modulus, but PA6/TRGO(600) nanocomposites showed better mechanical properties. These findings indicated that TRGO obtained at a higher temperature imparts better barrier and mechanical properties to PP, while TRGO obtained at a lower temperature imparts better barrier and mechanical properties to PA6. (C) 2018 Society of Plastics Engineers