Hexagonal boron nitride nanosheets (a-h-BNNS) functionalized with good in-plane crystal structure were prepared by wet ball milling.Vacuum suction filtration and hot-pressing treatment were used to prepare a high thermal conductive composite material with a-h-BNNS as the thermal conductive filler and cellulose nanofiber (CNF) as the matrix.The hot-pressing treatment made the a-h-BNNS link tightly in the composite,thereby building a good thermal conduction path and improving the in-plane thermal conductivity (TC).When the hot-pressed composite material had an a-h-BNNS mass fraction of 10%,the in-plane TC of the material was approximately doubled compared to that of the untreated material.When the mass fraction of a-h-BNNS was 30%,the in-plane TC can reach 6.67W/(m·K).However,as the mass fraction of a-h-BNNS continued to increase,the mechanical properties decreased significantly,and the in-plane TC continued to increase.This highly thermally conductive material with good flexibility was expected to be used in high power and foldable electronic devices.
Pei Kai, Tian Xiaohui, Sun Jinyu, Yuan Yizhong
. Preparation and property of cellulose-based thermal conductive composite material[J]. New Chemical Materials, 2021
, 49(5)
: 222
-226
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.05.050
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