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Solvent evaporation induced self-assembly of graphene foam for thermally conductive polymers

机译：溶剂蒸发诱导石墨烯泡沫的自组装用于导热聚合物

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摘要

Graphene, a new carbon material with the highest thermal conductivity (TC) in known materials, is a good candidate for polymer-based thermally conductive material applications. However, the homogeneous dispersion of graphene and effective construction of graphene-based thermally conductive network in the polymer matrix still remains a big challenge. In this paper, we report an effective way to avoid aggregation of graphene in polymers through the fabrication of 3D porous graphene foam (GF) in advance by a simple solvent evaporation induced self-assembly method. The as-prepared GF is proved to be an effective thermally conductive network after the epoxy perfusion, giving rise to a high TC of 11.58 W (m(-1) K-1) for the GF/epoxy composite. In addition, anisotropic TC in the GF/epoxy composites is observed because of the oriented arrangement of graphene sheets in the GF due to solvent evaporation. Besides, further improvement of TC to 16.69 W (m(-1) K-1) can be achieved by addition of polyvinyl pyrrolidone (PVP) during the preparation of GF, which can be ascribed to the reduction of interfacial thermal resistance by amorphous carbon generated from pyrolysis of PVP.
机译：石墨烯是一种具有最高导热率（Tc）的新型碳材料，是聚合物基导热材料应用的良好候选者。然而，石墨烯的均匀分散和有效施工在聚合物基质中的石墨烯的导热网络仍然是一个很大的挑战。在本文中，我们通过简单的溶剂蒸发诱导的自组装方法预先通过制造3D多孔石墨烯泡沫（GF）来避免聚合物中石墨烯聚集的有效方法。在环氧灌注之后，证明了如制备的GF是有效的导热网络，产生GF /环氧复合材料的11.58W（m（-1）K-1）的高Tc。另外，由于溶剂蒸发引起的GF中的石墨烯片的定向布置，观察到GF /环氧复合材料中的各向异性Tc。此外，通过加入在GF的制备过程中加入聚乙烯吡咯烷酮（PVP）可以进一步改善TC至16.69W（m（-1）k-1），这可以通过无定形碳来归因于降低界面热阻的降低由PVP的热解产生。

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  • 来源
    《RSC Advances》 |2017年第25期|共6页
  • 作者

    Ma Jingbo; Zhou Xufeng; Ding Shiyun; Liu Zhaoping;

  • 作者单位

    Chinese Acad Sci NIMTE Key Lab Graphene Technol &

    Applicat Zhejiang Prov Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci NIMTE Key Lab Graphene Technol &

    Applicat Zhejiang Prov Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci NIMTE Key Lab Graphene Technol &

    Applicat Zhejiang Prov Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci NIMTE Key Lab Graphene Technol &

    Applicat Zhejiang Prov Ningbo 315201 Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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