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

Construction of a three-dimensional (3D) vertically aligned filler network in polymer matrix has been believed 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 polymer matrix for the high-flux heat-conduction. To address this problem, herein, nanofibrillated cellulose (NFCs) assisted unidirectional freeze-drying of boron nitride nanosheets (BNNSs) slurry was used to prepare a novel epoxy composite containing 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 in the preparation of polymer composite with high heat-conduction efficiency to address the heat dissipation of modern electronics.