▎ 摘　　要

Adenine containing phthalonitrile (ADCN)/graphene/Fe3O4 composites with excellent EMI performance, outstanding thermal, thermo-oxidative stability, and heat resistance ae introduced. The interactions between ADCN and nanofillers combined with high-energy ball milling-molding sintering processing method ensure the uniform dispersion of nanofillers in the matrix. The EMI shielding effectiveness (EMI SE) of ADCN/G/Fe3O4 is up to 50 dB with only 0.5 mm thickness, which is one of the best EMI performance compared with previous reports on conductive polymer composites (CPCs). The high-performance ADCN polymer introduces outstanding thermal, thermo-oxidative stability and heat resistance into the composites. The T5% in the air of composites could still maintain more than 491 degrees C, and the EMI value of composites after flame retardancy test could reach 40 dB. The results prove that ADCN/G/Fe3O4 composite is a promising candidate that could be used in the aerospace industry and under extreme working conditions.