Cui Sufei, Wu Wei, Liu Chao, Wang Yi, Chen Qiming, Liu Xingrong
Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, PR China.
Shenzhen Research Institute of ECUST, Shenzhen, 518063, PR China.
Nanoscale. 2021 Nov 11;13(43):18247-18255. doi: 10.1039/d1nr04075h.
Three-dimensional thermally conductive graphene aerogels have become more and more significant in practical thermal management applications. However, the interface between the graphene aerogel and the polymer has a strong interface thermal resistance, and the compatibility between the interfaces is also poor. In this study, a simple and versatile method for grafting graphene aerogels with titanate coupling agents on the surface was developed so that the modified graphene aerogels exhibit excellent thermal conductivity and mechanical properties and reduce the interface thermal resistance and increase the interface compatibility between graphene aerogels and epoxy resin. A high thermal conductivity of 2.53 W m K was obtained under a low graphene load of 2.5 wt%, corresponding to a thermal conductivity enhancement of approximately 1388% compared with pure epoxy resin. It provides a facile new idea for the preparation of high-quality three-dimensional graphene epoxy composites.
三维导热石墨烯气凝胶在实际热管理应用中变得越来越重要。然而，石墨烯气凝胶与聚合物之间的界面具有很强的界面热阻，且界面之间的相容性也很差。在本研究中，开发了一种在表面用钛酸酯偶联剂接枝石墨烯气凝胶的简单通用方法，使得改性后的石墨烯气凝胶表现出优异的热导率和力学性能，降低了界面热阻，并提高了石墨烯气凝胶与环氧树脂之间的界面相容性。在2.5 wt%的低石墨烯负载量下获得了2.53 W m⁻¹ K⁻¹的高导热率，与纯环氧树脂相比，热导率提高了约1388%。它为制备高质量的三维石墨烯环氧复合材料提供了一种简便的新思路。
