三维石墨烯具有高孔隙率、高热导率和良好的热稳定性等优点。提出利用三维石墨烯形成的连续“导热链”填充环氧树脂从而改善环氧树脂传热性能的方法,通过化学氧化还原法制备了三维石墨烯,进而采用浇注法制备三维石墨烯/环氧树脂复合材料。实验测试了导热性能、比热容和玻璃化转变温度等热物性参数。结果表明:三维石墨烯可大幅度提髙环氧树脂的导热性能。在三维石墨烯的质量分数为3%时,环氧树脂的热导率提高近7倍。研究结果为三维石墨烯在导热复合材料领域的应用提供了实验依据。
Graphene has many fascinating properties such as high specific surface area,high thermal conductivity and good thermal stability.Three-dimensional graphene film (3D-GF) consists of an interconnected network of graphene,not only having the fascinating properties of graphene,but also forming the continuous fast transport channel of heat.The method of using 3D-GF to improve the thermal properties of epoxy resin was proposed.3D-GF was simply prepared by chemical oxidation and thermal reduction,and then,3D-GF/epoxy composites were prepared by casting process.The thermal properties of pure epoxy resin and its composites such as the thermal conductivity,specific heat capacity and glass transition temperature ware measured.It is found that 3D-GF substantially improved thermal properties of epoxy resin.Even if the mass fraction of 3D-GF was as low as ～3 wt%,the thermal conductivity of 3D-GF/epoxy can reach 1.245W/(m·K),which was nearly 7 times higher than the pure epoxy resin.Besides,3D-GF improved the heat capacity of epoxy resin,and reduced the glass transition temperature of epoxy resin.This study provided experimental support for large scale preparation of 3D-GF and application of 3D-GF in the field of thermally conductive composites.
[1] Geim A K,Novoselov K S.The rise of graphene[J].Nature Materials,2007,6(3):183-191.
[2] Novoselov K S,Geim A K,Morozov S V,et al.Electric field effect in atomically thin carbon films[J].Science,2004,306(5696):666-669.
[3] Balandin A A,Ghosh S,Bao W Z,et al.Superior thermal conductivity of single-layer graphene[J].Nano Lett,2008,8(3):902-907.
[4] Lee C,Wei X D,Kysar J W,et al.Measurement of the elastic properties and intrinsic strength of monolayer graphene[J].Science,2008,321(5887):385-388.
[5] Kim H,Abdala A A,Macosko C W.Graphene/polymer nanocomposites[J].Macromolecules,2010,43(16):6515-6530.
[6] Salavagione H J,Gómez M A,Martínez G.Polymeric modification of graphene through esterification of graphite oxide and poly(vinyl alcohol)[J].Macromolecules,2009,42(17):6331-6334.
[7] Brodie B C.On the atomic weight of graphite[J].Philosophical Transactions of the Royal Society of London,2009,149(1):249-259.
[8] Wang S,Tambraparni M,Qiu J,et al.Thermal expansion of graphene composites[J].Macromolecules,2009,42(14):5251-5255.
[9] Shahil K M F,Balandin A A.Graphene-multilayer graphene nanocomposites as highly efficient thermal interface materials[J].Nano Letters,2012,12(2):861-867.
[10] Chen Z P,Ren W C,Gao L B,et al.Three-dimensional flexible and conductive interconnected graphene networks grown by chemical vapour deposition[J].Nat Mater,2011,10(6):424-428.
[11] Li C,Shi G.Three-dimensional graphene architectures[J].Nanoscale,2012,4(18):5549-5563.
[12] Yuan X,Zhang Y,Yang L,et al.Three-dimensional activated graphene network-sulfonate-terminated polymer nanocomposite as a new electrode material for the sensitive determination of dopamine and heavy metal ions[J].Analyst,2015,140(5):1647-1654.
[13] Sun H,Xu Z,Gao C.Multifunctional,ultra-flyweight,synergistically assembled carbon aerogels[J].Advanced Materials,2013,25(18):2554-2560.
[14] Deng H,Lin L,Ji M,et al.Progress on the morphological control of conductive network in conductive polymer composites and the use as electroactive multifunctional materials[J].Progress in Polymer Science,2014,39(4):627-655.
[15] Hummers W S,Offeman R E.Preparation of graphitic oxide[J].Journal of the American Chemical Society,1958,80(6):1339-1339.
[16] Pei S F,Cheng H M.The reduction of graphene oxide[J].Carbon,2012,50(9):3210-3228.
[17] Ash B J,Schadler L S,Siegel R W.Glass transition behavior of alumina/polymethylmethacrylate nanocomposites[J].Materials Letters,2002,55(1):83-87.
[18] Song N J,Chen C M,Lu C,et al.Thermally reduced graphene oxide films as flexible lateral heat spreaders[J].Journal of Materials Chemistry A,2014,2(39):16563-16568.
基金资助
国家重点基础研究发展计划(973)(2015CB251503);国家自然科学基金(51406052);中央高校基本科研业务费专项资金项目(2015XS85)
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