▎ 摘　　要

In this article, the compatibilizing effect of exfoliated graphene nanoplatelets (xGnPs) on polypropylene/polystyrene (PP/PS) (80/20) blends was investigated, focusing on the rheology, morphology, and mechanical and thermal properties. Rheological analyses were shown, the addition of xGnP tends to increase the storage modulus and complex viscosity, due to the confinement of polymer chains and reducing their motion. Scanning electron microscope observation revealed that incorporation of xGnP results in obvious reduction in the domain diameter of dispersed PS phase, indicating that xGnP is an effective compatibilizer. Transmission electron microscopy micrographs showed the presence of graphene nanoparticles in the phase interface as expected. The addition of xGnP to PP/PS blend increased the tensile modulus and decreased elongation at break because of its rigidity and intrinsic mechanical characteristics. Reinforcement of flexible polymer chains with very high modulus graphene pellets leads to a more brittle and a stiffer blend. It was also shown that graphene nanoplatelets can increase crystalline part of the samples and affect the behavior of blends.