陈小华,石逍,冯先强,吴华丽,宁小花,张明远.碳纤维骨架石墨烯导电导热薄膜的制备及表征[J].湖南大学学报:自然科学版,2019,(6):31~36
碳纤维骨架石墨烯导电导热薄膜的制备及表征
Preparation and Properties of Carbon Skeleton Graphene-based Conductive and Thermal Conductive Films
  
DOI:
中文关键词:  氧化石墨烯  碳纤维  导电性能  导热性能
英文关键词:graphene oxide  carbon fiber  conductive properties  thermal conductivity
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作者单位
陈小华,石逍,冯先强,吴华丽,宁小花,张明远 (湖南大学 材料科学与工程学院湖南 长沙 410082) 
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中文摘要:
      在对碳纤维进行除浆和预氧化的基础上,将其与中间相沥青甲苯溶液混合,通过抽滤法制备碳纤维薄膜骨架,二次抽滤氧化石墨烯填充到碳骨架之间,经热处理后制得具有三维网络结构的自支撑G-CF-MP复合薄膜.探索和分析了不同碳化和石墨化温度对薄膜材料形貌、导电性以及导热性能的影响. 通过结构表征发现,碳纤维之间相互搭建构成高机械性能的碳骨架,碳纤维表面以及纤维之间的空隙被石墨烯均匀地包覆和填充,中间相沥青在达到软化点后呈现出流动性和黏性,充分润湿碳纤维与石墨烯之间的间隙,3种碳材料协同作用,从而获得了高机械强度以及高导电性的G-CF-MP复合薄膜材料. 导电性测试发现,石墨化处理可以有效提高材料的导电性,G-CF-MP复合薄膜在经过900 ℃碳化后的方阻为2.853 Ω/sq,经过石墨化处理后的方阻降低为0.229 Ω/sq. 经过导热性能测试,G-CF-MP(900 ℃)的热导率为475.2 W/(m·K),G-CF-MP(2 300 ℃)的热导率为532.8 W/(m·K).
英文摘要:
      Carbon fiber was pre-oxidized and desized, and then mixed with mesophase pitch toluene solution. Carbon fiber membrane skeleton was prepared by vacuum assisted flow-filtration,and secondary filtration graphite oxide was filled between carbon skeletons. A self-supporting G-CF-MP composite film with a three-dimensional network structure was obtained after heat treatment. The effects of different heat treatment temperatures of carbonation and graphitization on the morphology,electrical conductivity,and thermal conductivity of the thin film materials were explored and analyzed. Through structural characterization,it is found that carbon fibers form a carbon skeleton with high mechanical properties. Carbon fiber surfaces and the spaces between the fibers are evenly coated and filled with graphene. The mesophase pitch exhibits fluidity and viscosity after reaching the softening point and then fully wets the gap between carbon fiber and graphene. The three carbon materials act synergistically to obtain a high mechanical strength and high conductivity G-CF-MP composite film material. Conductivity test found that graphitization can effectively improve the conductivity of the material. The square resistance of G-CF-MP composite film after carbonization at 900 ℃ is 2.853 Ω/sq,and the square resistance after graphitization is 0.229 Ω/sq. The thermal conductivity test results show that the thermal conductivity of G-CF-MP(900 ℃) is 475.2 W/(m·K),and the thermal conductivity of G-CF-MP(2 300 ℃) is 532.8 W/(m·K).
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