氧化石墨烯多层装配水平对聚合物复合材料热性能的影响

发布时间：2018-05-24 10:54

本文选题：热管理 + 聚合物复合材料　；参考：《塑料工业》2017年04期

【摘要】：氧化石墨烯(GO)具有优异的热、力学等性能,被广泛用于提高电子封装用聚合物复合材料的热性能。然而,由于缺乏GO多层装配水平对聚合物热性能影响的研究,在选择GO增强体时,其多层装配的适宜水平选择成为难题。研究了两种装配水平(GO-1,34 nm;GO-2,7 nm;片径相近)的GO对环氧树脂(EP)热性能的影响。结果表明,由于多层装配水平不同,GO-1表面较平滑,呈相对刚性片状;而GO-2表面折皱起伏,呈柔性薄纱状。相比纯EP,GO-1(3%)/EP复合材料热导率提高了248%,热膨胀系数降低了37%,半失重温度提高了6 K;而GO-2(2%)/EP复合材料热导率提高了105%,热膨胀系数降低了24%,半失重温度提高了5 K。研究表明,GO的多层装配水平影响了其表面官能团含量、在基体中剥离/分散状态以及界面结合强度等,导致了其对树脂热性能不同的影响。因此,适当提高GO多层装配水平有利于增强树脂热性能,这对于利用其他类似GO具有层状结构的增强体改善聚合物热性能具有一定的参考意义。
[Abstract]:Graphene oxide (GOO) has been widely used to improve the thermal properties of polymer composites for electronic packaging due to its excellent thermal and mechanical properties. However, due to the lack of research on the effect of go multi-layer assembly level on the thermal properties of polymers, it is difficult to select the appropriate level of multi-layer assembly for go reinforcements. The effect of go on the thermal properties of epoxy resin EPs with two kinds of assembly level (GO-1 ~ (34) nm ~ (2 +) GO-2N ~ (2 +) 7 nm) was studied. The results show that the surface of GO-2 is relatively rigid and flake due to the different level of multilayer assembly, while the surface of GO-2 is wrinkled and undulating, showing a flexible gauze. Compared with the pure EPGO-1 / EP composite, the thermal conductivity increased by 248%, the thermal expansion coefficient decreased by 37%, the semi-weightlessness temperature increased by 6 K, while the thermal conductivity of the GO-2(2%)/EP composite increased by 105%, the thermal expansion coefficient decreased by 24%, and the semi-weightlessness temperature increased by 5 K. The results show that the multilayer assembly level of go affects the content of surface functional groups, the peeling / dispersing state in the matrix and the interfacial bonding strength, which results in different effects on the thermal properties of the resin. Therefore, increasing the level of go multilayer assembly is beneficial to enhance the thermal properties of the resin, which has a certain reference significance for improving the thermal properties of polymers by using other reinforcements with layered structure similar to go.
【作者单位】：南京理工大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51203074)
【分类号】：TB332

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