中文摘要：

聚丙烯（PP）与石墨通过双螺杆共混挤出制备了导热复合材料。研究表明：复合材料的热导率随石墨含量的增加而增加；在相同石墨含量下，高碳石墨填充聚丙烯比低碳石墨填充聚丙烯的热导率提高了10．9％；采用小粒径的石墨比大粒径石墨将复合材料的热导率提高了19％；钛酸酯偶联剂可以改善石墨与聚丙烯的相容性并提高复合材料的热导率，当偶联剂含量为1份时，热导率提高了12％；同时在鳞片石墨中复合添加膨胀石墨也可以提高复合材料的热导率；导热通路形成会伴随着聚合物熔体流动性能的降低。

英文摘要：

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.