A High-Mechanical-Strength Carbon/Graphene Porous Composite with Improved EMI Shielding Derived from High Nitrogen-Containing Bio-based Adenine-Containing Phthalonitrile Resin

Nitrogen-doped porous graphene/adenine-containing phthalonitrile (graphene/ADCN) carbon composites with excellent mechanical properties and electromagnetic interference (EMI) shielding performance were prepared by the high-energy ball milling molding-sintering method. The structure, morphology, electrical conductivity, dielectric properties, EMI shielding performance, and mechanical properties were characterized. The results show that the introduction of the dipole effect can confer improved electrical conductivity and EMI shielding properties to graphene/ADCN carbon composites. The porous structure increases the multiple reflections and improves the EMI performance. As a mechanical reinforcement phase, graphene was introduced to maintain the porous structure and improve the mechanical properties. The EMI performance of graphene/ADCN carbon composites reached 47dB (7.5wt.% graphene) with only 0.94 mm thickness. Meanwhile, the maximum bending stress reached 292 MPa, and the maximum compressive stress reached 143 MPa. [GRAPHICS] .