Rheological properties of graphene oxide/polyamide 6 composites

Abstract In this work, graphene oxide (GO)/polyamide 6 (PA6) nanocomposites with different graphene content (0.03–0.5 wt%) were prepared via in situ polymerization of GO and ε‐caprolactam. The linear and nonlinear rheological properties and thixotropy of GO/PA6 nanocomposites are investigated using steady state, dynamic, and transient rheological method with a Haake plate rotary rheometer. Cox/Merz rules and Cross model were used to fit the shear rate sweep and dynamic frequency sweep data, and a wider range(10 ⁻² –10 ⁴ s ⁻¹ ) of flow curve was obtained. The results show the PA6 and GO/PA6 melts are shear thinning fluid without yield stress, and have thixotropy. Highlights Dynamic, steady, and transient rheological tests were performed. Cox/Merz rules and Cross model were used to fit the data. A wider range(10 ⁻² –10 ⁴ s ⁻¹ ) of flow curve was obtained.