Polypropylene/Graphite Composite with Thermal Conductivity

PP/graphite composite was prepared by twin-screw extrusion.The study of the relation of thermal conductivity of composite and graphite content showed that the thermal conductivity of composite increased with the increase of the graphite content.Compared to that of low carbon graphite filled polypropylene,the thermal conductivity of high carbon graphite filled polypropylene was increased by 10.9 % under the same graphite content.Compared small size particles of graphite with big size particles,thermal conductivity of the small particles composite was increased by 19 %.After treatment with Titanate coupling agent TM-38S,the compatibility of graphite and polypropylene and the thermal conductivity of composite could be improved,when the coupling agent content was 1 phr,thermal conductivity increased by 12 %,and adding the expanded graphite in the flake graphite could also improve the thermal conductivity of composite.