The surface of hollow glass microspheres(HGM) was modified with different silane coupling agents KH550 and KH560.The hollow glass microspheres/polyimide composite films were prepared by in-situ polymerization using pyromellitic dianhydride and 4,4′-diaminodiphenyl ether as raw materials and N,N-dimethylacetamide as solvent.The modification of microspheres was characterized by FT-IR and scanning electron microscope(SEM).The results showed that silane coupling agents are successfully grafted onto microsphere surface.With the doping content of microspheres increased,the mechanical properties decreased to a certain extent.However,the dielectric properties of composite films were reduced obviously.The dielectric constant of film filled with unmodified hollow glass microspheres decreased from 3.5 to 2.4.The minimum dielectric constant of film modified by KH550 could reach about 2.
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