▎ 摘　　要

In this study, we have prepared highly conductive polypropylene (PP)/poly(ethylene terephthalate) (PET) blends with high electromagnetic interference (EMI) shielding performances by incorporating very low contents of thermally reduced graphene (TRG) through melt compounding method. Based on scanning electron microscopy and transmission electron microscopy images, the blends exhibited co-continuous morphologies in which TRG nanosheets had been thermodynamically and kinetically driven into PET polymer resulting in a double percolated structure. Both direct current and AC electrical conductivities of the blend nanocomposites significantly increased with TRG addition and a dramatically low electrical percolation threshold of 0.08 vol% was achieved. Electromagnetic properties were investigated by measuring complex permittivity and complex permeability of the samples in the X-band frequency range (8.2-12.4 GHz). The EMI shielding effectiveness considerably increased with increasing TRG loading and depending on the frequency, a shielding effectiveness of 40-60 dB was obtained with incorporation of only 2 vol % of TRG. (C) 2018 Society of Plastics Engineers