In order to improve the thermal conductivity and electrical insulation properties of polyimide matrix composites,fluorographene nanosheets were prepared by ultrasonic exfoliation process,and fluorographene/polyimide composite films with horizontal directional thermal conductivity characteristics were prepared by hot-pressing induced orientation process.The results show that increasing the amount of fluorinated graphene can improve the in-plane thermal conductivity of the composite film.When the mass fraction of fluorinated graphene is 30%,the in-plane thermal conductivity of the composite film is 2.4 W/(m·K).When the amount of fluorinated graphene increases,the DC withstand voltage performance of the composite film slightly decreases,but the electrical tracking resistance of the composite film increases due to the improved phonon transfer efficiency in the composite film.The above research results can provide reference for the preparation of composite films with high thermal conductivity and high electrical insulation performance.
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