高集成度电子器件的快速发展对热管理材料提出了定向散热需求,而现有柔性相变材料(FPCM)的各向异性热传导性能难以满足这一要求。采用定向冷冻法制备了由导热增强剂一维碳纳米管(CNTs)和二维石墨烯构成的杂化碳气凝胶(CA)导热骨架,并通过真空吸附法与石蜡(PA)、烯烃嵌段共聚物(OBC)复合。结果表明:CNTs的轴向取向特性有效地引导了石墨烯定向排列,从而提高了导热骨架的结构取向度。当PA∶OBC∶CA质量比为60∶32∶8时,所得杂化CA基FPCM的轴向与径向热导率差值达到0.59W/(m·K),较单一石墨烯基CA制备的FPCM提升了136%,实现了热导率向异性的显著增强。
The rapid development of highly integrated electronic devices has created an urgent demand for directional heat dissipation on thermal management materials,while conventional flexible phase change materials (FPCMs) fail to meet this requirement due to their inadequate anisotropic thermal conductivity.In this study,a hybrid carbon aerogel (CA) thermal conductive framework was fabricated via directional freezing using one-dimensional carbon nanotubes (CNTs) and two-dimensional graphene as thermal enhancement agents,which was subsequently combined with paraffin wax (PA) and olefin block copolymer (OBC) through vacuum impregnation.The results indicated that the axial orientation characteristics of CNTs effectively guided the directional alignment of graphene,thereby enhancing the structural orientation degree of the thermal conductive framework.When the mass ratio of PA∶OBC∶CA was 60∶32∶8,the as-prepared hybrid CA-based FPCM achieved a remarkable axial-radial thermal conductivity difference of 0.59W/(m·K),representing a 136% improvement compared to FPCM prepared with single graphene-based CA,which significantly enhanced the thermal conductivity anisotropy.
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基金资助
河南省科技攻关项目(222102520030);河南省自然科学基金项目(232300420310)
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