Rational design and fabrication of lightweight porous polyimide composites containing polyaniline modified graphene oxide and multiwalled carbon nanotube hybrid fillers for heat-resistant electromagnetic interference shielding

Abstract

In this paper, porous polyimide composites (PPIC) for electromagnetic interference (EMI) shielding were rationally designed and fabricated by using polyimide (PI) matrix, polyaniline modified graphene oxide (PANI-g-GO) and multiwalled carbon nanotube (MWCNT) as hybrid fillers through innovatively combining in-situ polymerization process and thermally assisted non-solvent induced phase separation (TNIPS) method. The polyimide matrix and porous structure endow the composites with good heat resistance and lightweight, and hybrid fillers can form effective conductive networks in the PI matrix, which results in the enhancement of EMI shielding performance. The porous polyimide composite with a hybrid filler content of 12 wt% (PPIC12) exhibited a low density of 0.56 g/cm3, high T10 of 554.81 °C, excellent EMI shielding effectiveness up to 28.2 dB at a thickness of 2 mm. Therefore, the novel porous polyimide composites are promising polymer-based EMI shielding materials with lightweight and good heat resistance.