Rapid developments of miniaturization and integration of modern electronic devices have been accompanied by increasing power density, which bring about urgent demands for polymer-based thermal interface materials (TIMs) with efficient thermal conductive properties. However, poor dispersibility of thermal conductive nano-fillers severely limits further improvement in the thermal conductivity of TIMs. Herein, poly(styrene-b-butadiene-b-styrene) (SBS)/graphite nanoplatelet (GNP) nanocomposites with well-dispersed GNPs were fabricated by in-situ shear exfoliation of graphite in SBS solution, followed by a co-precipitation process. The SBS macro-molecules were immobilized on the surfaces of exfoliated GNPs through π-π interaction, which not only prevented the exfoliated GNPs from restacking in the suspension, but also improved their dispersibility in SBS matrix. Thus, GNPs were uniformly dispersed in SBS/GNP nanocomposites and possessed strong interfacial adhesion with SBS, which formed efficient thermal conductive filler networks with reduced interfacial thermal resistance. Hence, at 14.7 vol% filler, SBS/GNP nanocomposites displayed an excellent thermal conductivity of 1.55 W m⁻¹ K⁻¹, which is 204% higher than SBS/commercial GNP (c-GNP) composites (0.51 W m⁻¹ K⁻¹) prepared by simply adding c-GNPs in SBS matrix. Moreover, SBS/GNP nanocomposites displayed enhanced tensile moduli and higher glass transition temperatures. Therefore, this work has provided a facile and promising route to manufacture high-performance TIMs in large scale.

现代化电子设备的小型化和集成化的快速发展伴随着功率密度的提高，这迫切要求具有高效导热性能的基于聚合物的热界面材料（TIM）。但是，导热纳米填料的分散性差，严重限制了TIM导热系数的进一步提高。本文中，通过在SBS溶液中对石墨进行原位剪切剥离来制备具有良好分散的GNP的聚（苯乙烯-b-丁二烯-b-苯乙烯）（SBS）/石墨纳米片（GNP）纳米复合材料，然后进行共沉淀工艺。SBS大分子通过π-π固定在脱落的GNP的表面相互作用，不仅阻止了脱落的GNP在悬浮液中重新堆积，而且还提高了它们在SBS基质中的分散性。因此，GNPs均匀地分散在SBS / GNP纳米复合物中，并且与SBS具有很强的界面粘合性，从而形成了具有降低的界面热阻的高效导热填料网络。因此，在填充量为14.7 vol％的情况下，SBS / GNP纳米复合材料的导热系数为1.55 W m ^-1  K ^-1，比SBS /商业GNP（c-GNP）复合材料（0.51 W m ^-1  K ）高204％^-1），只需在SBS矩阵中添加c-GNP即可。此外，SBS / GNP纳米复合材料显示出更高的拉伸模量和更高的玻璃化转变温度。因此，这项工作为大规模生产高性能TIM提供了简便而有希望的途径。