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石墨烯是由碳原子构成的单原子厚度的二维层状材料,具有许多优异的性能,是当前国内外研究热点之一,受到物理、化学、材料、电子、能源、生物和信息技术等领域的广泛关注。石墨烯是目前所测得导热系数最高的材料,在强化传热领域具有潜在的应用价值。较为系统地研究了石墨烯的制备方法及石墨的粒径对环氧树脂复合材料热导率的影响。实验发现,所采用的三种插层剂(硫酸、十四烷基胺及FeCl3)中,添加量较少时(如体积分数为1%),十四烷基胺插层法最为有效。而添加量较高时,硫酸插层制备的石墨烯纳米片效果最佳。制备石墨烯纳米片所采用的石墨粒径较大时,石墨烯/环氧树脂(Epoxy)复合材料的热导率越高。通过优化石墨烯的制备方法,石墨烯纳米片在体积分数为3.9%时,其热导率可达0.94 W·m~(-1)·K~(-1)),比基体材料提高了2.6倍。
Graphene is a two-dimensional monolayer material composed of carbon atoms and has many excellent properties. It is one of the hot research fields both at home and abroad, and has been widely used in many fields such as physics, chemistry, materials, electronics, energy, biology and information technology The widespread concern. Graphene is the highest thermal conductivity of the measured material, has potential applications in the field of enhanced heat transfer. More systematically studied the preparation of graphene and graphite particle size on the thermal conductivity of epoxy resin composites. The experiment found that the three intercalation agents used (sulfuric acid, tetradecylamine and FeCl3), when added in small amounts (such as the volume fraction of 1%), tetradecylamine intercalation method is the most effective. The higher the amount of addition, the sulfuric acid intercalation prepared graphene nanosheets best. The larger the graphite particle size, the higher the thermal conductivity of the graphene / epoxy composite material is. By optimizing the preparation method of graphene, the thermal conductivity of graphene nanosheets at the volume fraction of 3.9% can reach 0.94 W · m -1 K -1, which is 2.6 higher than that of the matrix Times