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Highly thermally conductive polyvinyl alcohol/boron nitride nanocomposites with interconnection oriented boron nitride nanoplatelets
Composites Science and Technology ( IF 9.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.compscitech.2020.108521
Gui Yang , Xiaodong Zhang , Ying Shang , Penghui Xu , Duo Pan , Fengmei Su , Youxin Ji , Yuezhan Feng , Yongzhi Liu , Chuntai Liu

Abstract With the development of high power density electronic devices, much more excessive heat is generated, which puts forward higher requirements for the thermal conductivity (TC) of polymer materials. In this study, polyvinyl alcohol (PVA)/boron nitride nanoplatelets (BNNSs) nanocomposites were fabricated with high in-plane TC via the combination of co-electrostatic spinning and spraying and hot-pressing technique. The high TC of the nanocomposites was due to the large lateral size of 2D BNNSs, which was obtained via boric acid-assisted ball milling. Another paramount structural factor is the selective distribution of these BNNSs on the surface of 1D PVA fibres. These interconnected BNNSs are oriented along the in-plane direction after pressing, which construct continuous heat conduction pathways in the nanocomposites. Additionally, the in-plane TC of the nanocomposites shows obvious thickness dependence, reaching 19.99 W/(m·K) with a thickness of 30 μm at BNNSs fraction of 40 wt%; it may be because BNNSs in thinner nanocomposites possess high orientation degree as their rotational freedom decreased.

中文翻译:

具有互连取向的氮化硼纳米片的高导热聚乙烯醇/氮化硼纳米复合材料

摘要 随着高功率密度电子器件的发展,产生的热量越来越多,对高分子材料的热导率(TC)提出了更高的要求。在这项研究中,聚乙烯醇(PVA)/氮化硼纳米片(BNNSs)纳米复合材料通过共静电纺丝和喷涂和热压技术相结合,具有高面内TC。纳米复合材料的高 TC 是由于 2D BNNS 的大横向尺寸,这是通过硼酸辅助球磨获得的。另一个重要的结构因素是这些 BNNS 在一维 PVA 纤维表面的选择性分布。这些相互连接的 BNNS 在压制后沿面内方向取向,在纳米复合材料中构建了连续的热传导路径。此外,纳米复合材料的面内 TC 显示出明显的厚度依赖性,在 BNNSs 分数为 40 wt% 时达到 19.99 W/(m·K),厚度为 30 μm;这可能是因为较薄的纳米复合材料中的 BNNS 随着其旋转自由度的降低而具有高取向度。
更新日期:2021-01-01
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