纳微快报（英文）2021，Vol.13Issue(2)：13-27,15.
3D Lamellar-Structured Graphene Aerogels for Thermal Interface Composites with High Through-Plane Thermal Conductivity and Fracture Toughness
3D Lamellar?Structured Graphene Aerogels for Thermal Interface Composites with High Through?Plane Thermal Conductivity and Fracture Toughness
摘要
Abstract
Although thermally conductive graphene sheets are efficient in enhancing in-plane thermal conductivities of polymers, the resulting nanocomposites usually exhibit low through-plane thermal conductivities, limiting their application as thermal interface materials. Herein, lamellar-structured polyamic acid salt/graphene oxide (PAAS/GO) hybrid aerogels are constructed by bidirectional freezing of PAAS/GO suspension followed by lyophilization. Subsequently, PAAS monomers are polymerized to pol-yimide (PI), while GO is converted to thermally reduced graphene oxide (RGO) during thermal annealing at 300 ℃. Final graphitization at 2800 ℃ converts PI to graphitized carbon with the inductive effect of RGO, and simultaneously, RGO is thermally reduced and healed to high-quality gra-phene. Consequently, lamellar-structured graphene aerogels with superior through-plane thermal conduction capacity are fabricated for the first time, and its superior through-plane thermal conduction capacity results from its vertically aligned and closely stacked high-quality graphene lamellae. After vacuum-assisted impregnation with epoxy, the resultant epoxy composite with 2.30 vol％ of graphene exhibits an outstanding through-plane thermal conductivity of as high as 20.0 W m?1 K?1, 100 times of that of epoxy, with a record-high specific thermal conductivity enhancement of 4310％. Furthermore, the lamellar-structured graphene aerogel endows epoxy with a high fracture toughness, ～ 1.71 times of that of epoxy.关键词
Anisotropic aerogels/Graphene/Thermal conductivity/Epoxy composites/Fracture toughnessKey words
Anisotropic aerogels/Graphene/Thermal conductivity/Epoxy composites/Fracture toughness引用本文复制引用
Pengfei Liu,Xiaofeng Li,Peng Min,Xiyuan Chang,Chao Shu,Yun Ding,Zhong-Zhen Yu..3D Lamellar-Structured Graphene Aerogels for Thermal Interface Composites with High Through-Plane Thermal Conductivity and Fracture Toughness[J].纳微快报（英文）,2021,13(2):13-27,15.基金项目
Financial support from the National Natural Science Foundation of China (51773008, 51533001, U1905217) and the National Key Research and Development Program of China (2016YFC0801302) is gratefully acknowledged. （51773008, 51533001, U1905217）
