石墨烯修饰的复合热界面材料的热性能研究

Thermal Performances of Graphene Modified Composite Thermal Interface Materials

采用还原氧化石墨烯(RGO)和三维网状石墨烯(3DGN)修饰环氧树脂,制备高性能的复合热界面材料(TIM)。其中,3DGN为声子提供了快速输运网络,而RGO则显著增强石墨烯导热填料与环氧树脂基材界面处声子的传输能力。RGO表面官能团的类型对样品的热性能有显著影响,羧基是促进界面区域声子传输的最佳选择。优化RGO(20(wt)%)和3DGN(10(wt)%)的质量分数后,样品的导热系数达6.5W·m^(-1)·K^(-1),是本征环氧树脂的32倍;此外,复合TIM的拉伸极限也达到280%。

Reduced graphene oxide(RGO) and three-dimensional graphene network(3 DGN) were adopted to co-modify epoxy resin for preparing thermal interface materials(TIM). In the resulting TIM, 3 DGN provides the fast transport channel to phonons, while RGO plays as a bridge to enhance the phonon transport ability on the interface between the graphene fill and epoxy resin matrix. The type of surface functional group of RGO was found the determinant to the resulting thermal performance, and the carboxyl group was the best choice to improve the interface contact level and promote the phonon transport. After optimizing the mass fraction of RGO(20(wt)%) and 3 DGN(10(wt)%), the obtained thermal conductivity of as-prepared TIM reaches 6.5 W·m^(-1)·K^(-1), which is 32 times higher than that of the pristine epoxy resin. Moreover, the mechanical performance of as-prepared TIMs was tested, the stretching limits reached 280%.