▎ 摘　　要

Quaternary ammonium can be served as the reducing agent for the fabrication of graphene/polyimide(rGO/PI) composites via the in. situ chemical reduction of graphene oxide dispersed in polyimide matrix during the thermal imidization of polyimdes. The results showed that the dielectric constant of graphene/polyimide composites was 40 times as compared with that of graphene oxide/polyimide without the addition of tetrabutyl ammonium bromide. The thermostabilities and mechanical properties of graphene/polyimide composites were also improved simultaneously. Moreover, the quaternary ammonium surfactants would not remain in the composites, which can be decomposed after the rGO/PI composite materials was produced under high temperature.