3D Vertically Aligned BNNS Network with Long-Range Continuous Channels for Achieving a Highly Thermally Conductive Composite

ACS Applied Materials & Interfaces
Xiongwei Wang, Peiyi Wu

Abstract

Construction of a three-dimensional (3D) vertically aligned filler network in a polymer matrix has been believed to be an effective method to attain a large through-plane thermal conductivity enhancement at relatively low filler loading. However, it is still a challenge to construct a vertically aligned filler network composed of many long-range continuous pore channels in a polymer matrix for the high-flux heat-conduction. To address this problem, herein, nanofibrillated cellulose (NFCs) assisted unidirectional freeze-drying of a boron nitride nanosheets (BNNSs) slurry was used to prepare a novel epoxy composite containing a 3D vertically aligned BNNS network with long-range continuous pore channels. The vertically aligned and nacre-mimetic channels make the composite possess a high through-plane thermal conductivity of 1.56 W m-1 K-1 at an extremely low BNNSs loading of 4.4 vol %, and a significant thermal conductivity enhancement efficiency of 167.3 per 1 vol % filler. Therefore, we think this work is expected to give a significant insight into the preparation of polymer composite with high heat-conduction efficiency to address the heat dissipation of modern electronics.

References

Feb 4, 2014·Chemistry of Materials : a Publication of the American Chemical Society·Hao BaiAntoni P Tomsia
Aug 16, 2014·Physical Chemistry Chemical Physics : PCCP·Hoing Lae LeeYoungjae Yoo
Feb 25, 2015·ACS Applied Materials & Interfaces·Heng ShenJian Xu
May 23, 2015·ACS Applied Materials & Interfaces·Chao YuanXiaobing Luo
Jul 23, 2016·Angewandte Chemie·Wenshuai ZhuSheng Dai

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