▎ 摘　　要

NOVELTY - Electromagnetic shielding film based on microporous polymer in-situ load comprises 4,4'-diamino-3-methyl biphenyl and dimethoxymethane as aggregate monomer, where the microporous polymer is obtained through condensation and cyclization reaction, and loading the microporous polymer is with conductive nanoparticles and/or magnetic nanoparticles and blending with a polymer matrix. USE - The electromagnetic shielding film is useful in flexible circuit board and related components. ADVANTAGE - The electromagnetic shielding film has high-load conductive nano particles and/or magnetic nano-particles. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of electromagnetic shielding film based on micro-porous polymer in situ load, comprising (i) dissolving the precursor of conductive nano particles and/or precursor of magnetic nano particles in the micro-porous polymer solution, keeping a certain temperature, adding reduction agent, stirring and performing the solvent thermal reduction to obtain the load body crude product, washing loading body crude product, centrifuging and drying to obtain the load body; and (ii) blending the load body and macromolecule polymer matrix, and dissolving in the organic solvent, and casting to obtain the electromagnetic shielding film.