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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。
Polypropylene (PP) and graphite were prepared through the twin-screw coextrusion extrusion. The results show that the thermal conductivity of composites increases with the increase of graphite content. The thermal conductivity of polypropylene filled with high carbon graphite is higher than that of low carbon graphite filled polypropylene by 10.9% at the same graphite content. Graphite has a 19% higher thermal conductivity than graphite with larger particle size. Titanate coupling agent can improve the compatibility between graphite and polypropylene and improve the thermal conductivity of composites. When the content of coupling agent is 1 , The thermal conductivity increased by 12%. At the same time, the addition of expanded graphite in flake graphite can also improve the thermal conductivity of the composites; the formation of thermal conduction path will be accompanied by the decrease of the flow properties of the polymer melt.