Abstract: Composites with highly thermal conductivity and corrosion resistance were prepared using PVDF as matrix，with flake graphite and carbon fibers as the fillers by melt mixing. The influences of filler’s content and surface modification on the thermal performance and mechanical properties of the composite were investigated. It was found that with increasing content of flake graphite the thermal conductivity increased，while the mechanical properties decreased. Carbon fibers could also improve the mechanical properties, but decreased the thermal conductivity. The surface modification favored the mechanical properties and thermal conductivity. The thermal conductivity of the composite reached 11.43 W/(m·K), tensile strength 48 MPa, and tensile elongation break 11 %.

Key words: poly(vinylidene fluoride), flake graphite, carbon fiber, composite, thermal conductivity, mechanical property