▎ 摘　　要

The evolution of rheological response, phase morphology, and electrical properties of PA6/POE blends (80/20) withgraphene primarily localized inside the POE minor phase and at theinterface are investigated during annealing under small-amplitudeoscillatory shear (SAOS). Analysis of the dynamic viscoelastic responseof these nanocomposites revealed that it is primarily governed by thegraphene 3-dimensional structure, which evolves during the rheologicalmeasurement. Comparing isochronal frequency sweeps with frequencysweeps close to the equilibrium condition illustrates that graphenecontent and the evolution of its 3D structure have the same impact onrheological and electrical properties. Interestingly, regardless of different blend morphology, the linear and nonlinear viscoelasticbehavior follow the fractal scaling theory indicating that the 3-dimensional graphene structure is self-similar. With increasinggraphene content, the phase morphology changes from typical droplet-matrix morphology to droplet clusters and cocontinuousmorphology. The stability of the blend morphology when annealing under SAOS (0.1 rad/s) depends on the balance between therate of coalescence and shape relaxation. Interestingly, our morphological observation for nanocomposites containing 0.5% and 1%of graphene shows that while the presence of graphene slows down the shape relaxation, it increases the coalescence rate within thefirst 30 min of annealing as compared to the neat blend. The increased coalescence rate comes from the compressive deformation applied during sample loading along with a slow shape relaxation and graphene bridging between neighboring domains