Multiscale study on the synergistic effect of interface heat transfer and filler structure on enhancing the thermal conductivity of boron nitride/alumina/polyurethane composites

IF 6.5 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Zhan Liu , Jialiang Xie , Chengke Wang , Peng Zou , Xin Zhang , Baiping Xu , Junhui Li
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Abstract

The design and preparation of polymer composites for microelectronic package with high thermal conductivity is an important route to solve the thermal problem of electronic devices. The synergistic effect of interface heat transfer and hybrid filler structure on the enhancement of thermal conductivity in polyurethane composites was analyzed using a multiscale approach. Firstly, the interface heat transfer characteristics and strengthening mechanism of BN-TPU and Al2O3-TPU regulated by functionalization were analyzed by atomic scale calculation. Then, the thermal conductivity of BN/Al2O3/TPU composites under different interface thermal resistance, filler distribution, filler ratio and contents were studied through representative volume elements with interface layer structure. The results indicate that, due to the functionalized molecules increasing the phonon vibration overlap between the filler and matrix and thereby reducing the interface thermal resistance, the thermal conductivity of the composite materials shows an increasing trend with interface functionalization. Moreover, under the combined effects of constructing oriented BN structures, optimizing the ratio between BN and Al2O3, and regulating interface functionalization, the composites showed excellent thermal conductivity at low filler content. The research can provide important guidance for the preparation of highly thermal conductive polymer composites.
界面传热和填料结构对提高氮化硼/氧化铝/聚氨酯复合材料导热性协同效应的多尺度研究
设计和制备具有高热导率的微电子封装用聚合物复合材料是解决电子器件热问题的重要途径。本文采用多尺度方法分析了界面传热和混合填料结构对聚氨酯复合材料热导率增强的协同效应。首先,通过原子尺度计算分析了功能化调节 BN-TPU 和 Al2O3-TPU 的界面传热特性和增强机理。然后,通过具有界面层结构的代表性体积元素,研究了 BN/Al2O3/TPU 复合材料在不同界面热阻、填料分布、填料比例和含量条件下的热导率。结果表明,由于官能化分子增加了填料与基体之间的声子振动重叠,从而降低了界面热阻,复合材料的热导率随界面官能化程度的增加而呈上升趋势。此外,在构建取向 BN 结构、优化 BN 与 Al2O3 的比例以及调节界面官能化的综合作用下,复合材料在较低的填料含量下也表现出了优异的导热性能。该研究可为制备高导热聚合物复合材料提供重要指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Composites Communications
Composites Communications Materials Science-Ceramics and Composites
CiteScore
12.10
自引率
10.00%
发文量
340
审稿时长
36 days
期刊介绍: Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.
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