Ge Gao, Mingqi Sun, Bing Dai, Lei Yang, Kang Liu, Zhenhuai Yang, Jiecai Han, Jiaqi Zhu
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引用次数: 2
摘要
由于大功率计算设备的散热问题,高性能热界面材料的需求日益增加。为了解决这一问题,本研究提出了一种沿面外方向单轴压缩泡沫石墨烯的微结构设计方法。泡沫石墨烯复合材料的导热系数沿压缩应变方向呈各向异性增长。在极低的填料含量为2.24 vol%时,面内导热系数从0.189显著增加到1.669 W m−1 K−1,而面外导热系数则略微增加到0.303 W m−1 K−1。此外,石墨烯含量为1.29 vol%时,样品的面内导热系数提高效率达到415.19%。通过构建基于石墨烯泡沫形貌简化的几何单元胞的理论模型,揭示了各向异性导热系数增强的机理。这种3型结构的单轴压缩方法为更可控地提高聚合物基复合材料的导热性提供了新的方向。
Anisotropic Enhancement in Thermal Conductivity of Graphene Foam/Polymer Composites Based on Uniaxial Compression
High-performance thermal interface materials are in increasing demand because of the problems of dissipating heat from high-power computing devices. To solve this problem, this study proposes a method of microstructural design through uniaxial compression of graphene foam along the out-of-plane direction. The thermal conductivity of the composites with graphene foam shows an anisotropic growth along the direction of the compressive strain. The in-plane thermal conductivity increases significantly from 0.189 to 1.669 W m−1 K−1 at an extremely low filler content of 2.24 vol%, whereas the out-of-plane thermal conductivity increases slightly to 0.303 W m−1 K−1. Moreover, the samples exhibit outstanding in-plane thermal conductivity enhanced efficiency, which reaches 415.19% at a 1.29 vol% graphene content. The mechanism of anisotropic thermal conductivity enhancement is revealed by constructing a theoretical model based on a geometrical unit cell simplified from the morphology of graphene foam. This uniaxial compression method of a 3 structure provides a novel direction for improving the thermal conductivity of polymeric matrix composites more controllably.
期刊介绍:
Macromolecular Materials and Engineering is the high-quality polymer science journal dedicated to the design, modification, characterization, processing and application of advanced polymeric materials, including membranes, sensors, sustainability, composites, fibers, foams, 3D printing, actuators as well as energy and electronic applications.
Macromolecular Materials and Engineering is among the top journals publishing original research in polymer science.
The journal presents strictly peer-reviewed Research Articles, Reviews, Perspectives and Comments.
ISSN: 1438-7492 (print). 1439-2054 (online).
Readership:Polymer scientists, chemists, physicists, materials scientists, engineers
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