使用湿法球磨方式制备了具有良好面内晶体结构、官能化的六方氮化硼纳米片(a-h-BNNS)。采用真空抽滤,并辅以热压成型的方式制备出以a-h-BNNS为导热填料、纤维素纳米纤维(CNF)为基体的高导热复合材料。热压处理使得复合材料中a-h-BNNS的连接更为紧密,从而构建出良好的导热通路,提高面内热导率(TC)。热压处理过的复合材料,a-h-BNNS添加量为10%(wt,质量分数)时,复合材料面内TC比未经处理的复合材料增加约1倍。当a-h-BNNS添加量为30%时,复合材料的面内TC可达6.67W/(m·K)。继续提高a-h-BNNS添加量,复合材料的力学性能下降较为明显,而面内TC持续上升。这种具有良好柔韧性的高导热复合材料有望应用于高功率和可折叠电子设备中。
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.
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