Multi-walled carbon nanotubes(MWCNTs),few-layer graphene(FLG)and car-bon black(CB)filled Polypropylene-Random(PPR)nanocomposites with different compo-nent contents were prepared by melt blending method in this study.The appearance,mor-phology and rheological properties of different polypropylene composites were studied by scanning electron microscope(SEM),capillary rheometer,rotational rheometer,and other methods.The results show that the amount and morphology of fillers will affect its vis-coelasticity and internal structure,and the addition of MWCNTs has significantly stronger changes in the viscoelasticity of PPR composites than CB and FLG.At the same content,only the PPR/MWCNTs system exhibits special rheological phenomena such as elongation hardening behavior,viscoelastic percolation,and increased shear thinning.The reason for this result is the formation of the self-entanglement of the high aspect ratio MWCNTs and the formation of the entanglement network structure between the MWCNTs and the matrix.
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