仿植物茎状层级结构石墨烯-液态金属/环氧树脂复合材料的制备  

Preparation of Graphene-Liquid Metal/Epoxy Resin Composites with Plant Stem-like Hierarchical Structure

作　　者：罗州 陈宇 姚飞 董群锋 杨立峰 刘传奇 江悦 LUO Zhou;CHEN Yu;YAO Fei;DONG Qunfeng;YANG Lifeng;LIU Chuanqi;JIANG Yue(Shenyang University of Chemical Technology,Shenyang Liaoning 110142,China;Beijing Institute of Aeronautical Materials,Beijing 100095,China;Zhejiang Tiannu Group Paint Co.,Ltd.,Jiaxing Zhejiang 314500,China;Jiaxing University,Jiaxing Zhejiang 314001,China)

机构地区：[1]沈阳化工大学,辽宁沈阳110142 [2]中国航发北京航空材料研究院,北京100095 [3]浙江天女集团制漆有限公司,浙江嘉兴314500 [4]嘉兴学院,浙江嘉兴314001

出　　处：《当代化工》2024年第5期1019-1025,共7页Contemporary Chemical Industry

基　　金：国家自然科学基金青年基金项目(项目编号:52003104);浙江省自然科学基金一般项目(项目编号:LY22E030007)。

摘　　要：环氧树脂具有优良的耐化学腐蚀性、电绝缘性和成本低廉的特点,可广泛应用于电子封装行业。然而,环氧树脂的本征低热导率(约0.2 W·m^(-1)·K^(-1))限制了其在热管理中的应用。在环氧树脂基体中加入高导热填料并形成有序结构是提高环氧树脂基复合材料热导率的有效方法。通过3D打印和定向冷冻制备了一种具有仿植物茎状层级结构的石墨烯-液态金属/环氧树脂复合材料。该复合材料在垂直方向上(40%总填料质量分数)表现出5.56 W·m^(-1)·K^(-1)的热导率,即约2.47倍于相同含量下的石墨烯-液态金属/环氧树脂共混复合材料。这种优异的导热性能可归因于沿石墨烯富集分层相的各向异性的茎状导热路径的形成和液态金属与环氧树脂间相容性的提高。同时,其独特的结构使该仿生复合材料保持了优异的机械性能。与纯光敏树脂骨架相比,该仿生复合材料在横向和纵向两个方向的抗压强度分别提高了192%和240%。因此,该石墨烯-液态金属/环氧树脂复合材料可作为热界面材料的最佳选择应用于电子工业。Due to its excellent chemical corrosion resistance,electrical insulation and low cost,epoxy resin can be widely used in the electronic packaging industry.However,the intrinsic low thermal conductivity of epoxy resins(0.2 W·m^(-1)·K^(-1))limits its application in thermal management.It is an effective method to increase the thermal conductivity of epoxy matrix composites by adding high thermal conductivity filler to epoxy matrix and forming ordered structure.In this work,graphene-liquid metal/epoxy resin composite with plant stem-like hierarchical structure was prepared by 3D printing technology and directional freezing method.Thermal conductivity of the composite in the vertical direction(40%mass fraction total filler)was 5.56 W·m^(-1)·K^(-1),which was about 2.47 times higher than that of the graphene-liquid metal epoxy blended composite at the same mass fraction.This excellent thermal conductivity was attributed to the formation of anisotropic stem-like thermal conductivity paths along the enriched graphene layered phase and the improved compatibility between the liquid metal and the epoxy resin.At the same time,the unique plant stem-like hierarchical structure enabled the composite to maintain excellent mechanical property.Compared with the pure photosensitive resin skeleton,the compressive strength of the graphene-liquid metal/epoxy with plant stem-like hierarchical structure in the transverse direction and longitudinal direction was increased by 192%and 240%,respectively.Consequently,the graphene-liquid metal/epoxy resin composite can be used as the best choice of thermal interface materials in the electronics industry.

关 键 词：石墨烯 液态金属 仿植物茎状层级结构 环氧树脂 纳米粒子 热传导 

分 类 号：TQ050.43[化学工程] TB333[一般工业技术—材料科学与工程]