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采用氧化还原法制备的石墨烯作为改性材料,研究石墨烯的含量及其还原程度对环氧树脂热导率的影响,并进一步测定复合热界面材料的热导率在高温下的稳定性。结果表明:石墨烯可以大幅提高环氧树脂的热导率,加入质量分数为15%的石墨烯可以使环氧树脂的热导率提高2 300%。石墨烯表面的剩余官能团对产物的热导率也有显著的影响,表面官能团可以充当声子输运通道并减小界面间的Kapitza热阻,但是过多的表面官能团会减小石墨烯的本征热导率。另外,通过优化石墨烯的还原程度及尺寸,提高了复合材料产物热导率在高温下的稳定性。
The graphene prepared by redox method was used as a modified material to study the influence of the content of graphene and its degree of reduction on the thermal conductivity of the epoxy resin and to further determine the thermal conductivity of the composite thermal interface material at high temperature. The results show that graphene can greatly improve the thermal conductivity of epoxy resin. Adding 15% (mass fraction) graphene can increase the thermal conductivity of epoxy resin by 2300%. The remaining functional groups on the graphene surface also have a significant effect on the thermal conductivity of the product. Surface functional groups can act as phonon transport channels and reduce the Kapitza thermal resistance at the interface, but excessive surface functional groups reduce the intrinsic properties of graphene Thermal conductivity. In addition, by optimizing the reduction degree and size of graphene, the thermal conductivity of the composite material product is improved at high temperature.