目前制备出的向异性柔性相变材料(FPCM),其热导率的向异性程度仍难以满足集成式电子器件的散热需求,为此,将1D碳纳米管(CNTs)与3D膨胀石墨(EG)协同构建制备向异性更高的杂化碳气凝胶(CA),代替传统的单一碳材料制备的CA,被作为FPCM的导热骨架,通过定向冷冻、真空吸附、熔融共混三步制备法,与石蜡、烯烃前段共聚物(OBC)复合,形成向异度更高的FPCM。结果表明:与单一EG基CA制备的FPCM相比,所制备的FPCM微观结构的定向性更高,当CA含量为8%时,径向热导率提升7.7%,轴向热导率提升10.6%。
The existing prepared anisotropic flexible phase change materials (FPCMs) still cannot meet the heat dissipation requirements of integrated electronic devices.To address this issue,a hybrid carbon aerogel (CA) with higher anisotropy was constructed by cobining 1D carbon nanotubes (CNTs) and 3D expanded graphite (EG).The hybrid CA was used as the thermal conductivity skeleton of the FPCMs instead of the traditional CA prepared from single carbon materials.Through a three-step preparation method of directional freezing,vacuum adsorption,and melt blending,a higher anisotropic FPCM was successfully prepared by compounding with paraffin and olefin block copolymer (OBC).The results confirmed that the microstructure of the prepared FPCM had higher orientation compared to that of the FPCM prepared from a single EG-based CA.When the CA content was 8%,the radial thermal conductivity increased by 7.7%,and the axial thermal conductivity increased by 10.6%.
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基金资助
河南省自然科学基金项目(232300420310);河南省粮油仓储建筑与安全重点实验室开放课题项目(2021KF-A03)
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