Preparation and properties of graphene-epoxy/alumina foam composites
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摘要: 以环氧树脂为代表的高分子聚合物在电子设备、电子封装和航空航天领域中有着广泛的用途,但环氧树脂极低的热导率限制了其应用。本文以泡沫氧化铝为骨架,在其表面负载氧化石墨烯,600~1 000℃温度下,对氧化石墨烯进行热还原,制备不同浓度的石墨烯负载的泡沫氧化铝,进一步与环氧树脂复合,得到复合材料。对泡沫氧化铝陶瓷所负载的石墨烯进行了XRD、Raman、SEM表征,对复合材料的热导率和电导率进行了测试。结果表明:热还原温度越高,氧化铝泡孔表面的氧化石墨烯被还原越充分。由于泡孔氧化铝的互相联通的管道,提供了声子传输的通道,0.533%负载量石墨烯就可以使复合材料的热导率达到了2.11 W/m·K,电导率达到了45 S/m。Abstract: Graphene-epoxy/alumina foam composites were prepared by repeated impregnation of alumina foam with a graphene oxide (GO) suspension and drying, followed by annealing at 600 to 1 000℃ under an Ar atmosphere and infiltration of epoxy and crosslinking agents into the foam under vacuum. XRD, SEM and Raman spectroscopy were used to characterize the microstructures of the composites. Results indicated that the GO was reduced more thoroughly at a higher annealing temperature. The thermal and electrical conductivities of the composite reached 2.11 W/m·K and 45 S/m, respectively, with a GO content of 0.533 wt% when an annealing temperature of 1 000℃ was used. The graphene loaded on the surface of the alumina foam greatly increased the thermal and electrical conductivities of the composites while the alumina foam network contributed to the fast phonon transport, which favored heat transport.
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Key words:
- Epoxy resin /
- Graphene /
- Alumina foam /
- Thermal conductivity
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Ganguli S,Roy A K,Anderson D P. Improved thermal conductivity for chemically functionalized exfoliated graphite/epoxy composites[J]. Carbon, 2008, 46(5):806-817. Fu S Y, Feng X Q, Lauke B, et al. Effect of particle size,particle/matrix interface adhesion and particle loading on mechanical properties of particulate-polymer[J]. Composites Part B Engineering, 2008, 39(6):933-961 Omrani A, Simon L C, Rostami A A. The effects of alumina nanoparticle on the properties of an epoxy resin system[J]. Materials Chemistry & Physics, 2009, 114(1):145-150. S J Park, Jin F L, Lee J R. Thermal and mechanical properties of tetrafunctional epoxy resin toughened with epoxidized soybean oil[J]. Materials Science & Engineering A, 2004, 374(1-2):109-114. Song S H,Park K H,Kim B H, et al. Enhanced thermal conductivity of epoxy-graphene composites by using non-oxidized graphene flakes with non-covalent functionalization[J]. Advanced Materials, 2013, 25(5):732-737. Teng C C, Ma C C, Chiou M. Synergetic effect of hybrid boron nitride and multi-walled carbon nanotubes on the thermal conductivity of epoxy composites[J]. Materials Chemistry and Physics, 2011, 126(3):722-728. Yang K, Gu M. Enhanced thermal conductivity of epoxy nanocomposites filled with hybrid filler system of triethylenetetramine-functionalized multi-walled carbon nanotube/silane-modified nano-sized silicon carbide[J]. Composites Part A Applied Science & Manufacturing, 2010, 41(2):215-221. Teng C C, Ma C C M, Chiou K C, et al. Synergetic effect of thermal conductive properties of epoxy composites containing functionalized multi-walled carbon nanotubes and aluminum nitride[J]. Composites Part B, 2012, 43(2):265-271. Zhou T, Wang X, Liu X, et al. Improved thermal conductivity of epoxy composites using a hybrid multi-walled carbon nanotube/micro-SiC filler[J]. Carbon, 2010, 48(4):1171-1176. Han Z, Fina A. Thermal conductivity of carbon nanotubes and their polymer nanocomposites:A review[J]. Progress in Polymer Science, 2011, 36(7):914-944. Chen G. Thermal conductivity and ballistic phonon transport in superlattices[C]//Aps March Meeting. APS March Meeting Abstracts, 1998. Du F P, Tang H, Huang D Y. Thermal conductivity of epoxy resin reinforced with magnesium oxide coated multiwalled carbon nanotubes[J]. International Journal of Ploymer Science, 2013, (15):9714-9722. He D, Bozlar M, Genestoux M, et al. Diameter- and length-dependent self-organizations of multi-walled carbon nanotubes on spherical alumina microparticles[J]. Carbon, 2010, 48(4):1159-1170. Teng C C, Ma M Chen-Chi, Lu C H, et al. Thermal conductivity and structure of non-covalent functionalized graphene/epoxy composites[J]. Carbon, 2011, 49(15):5107-5116. H Im, Kim J. Thermal conductivity of a graphene oxide-carbon nanotube hybrid/epoxy composite[J]. Carbon, 2012, 50(15):5429-5440. Guan F L, Gui C X, Zhang H B, et al. Enhanced thermal conductivity and satisfactory flame retardancy of epoxy/alumina composites by combination with graphene nanoplatelets and magnesium hydroxide[J]. Composites Part B, 2016, 98:134-140. Yu A,Ramesh P,Sun X. Enhanced thermal conductivity in a hybrid graphite nanoplatelet-carbon nanotube filler for epoxy composites[J]. Advanced Materials, 2008, 20(24):4740-4744. Michael J McAllister, Je-Luen Li, Douglas H. et al. Single sheet functionalized graphene by oxidation and thermal expansion of graphite[J]. Chemistry Materials, 2007, 19(18):4396-4404 Yang P,Li X,Zhao Y. Effect of triangular vacancy defect on thermal conductivity and thermal rectification in graphene nanoribbons[J]. Physics Letter A,2013, 377:2141-2146. Huang X, Iizuka Tomonori,Jiang PK. Role of interface on the thermal conductivity of highly filled dielectric epoxy/AlN composites[J]. J Physical Chemistry C, 2012, 116(25):13629-13639. Hong JP, Yoon S W, Wang T H. High thermal conductivity epoxy composites with bimodal distribution of aluminum nitride and boron nitride fillers[J]. Thermochimica Acta, 2012, 537(11):70-75. Kim J,Im H,Kim J M. Thermal and electrical conductivity of Al(OH)3 covered graphene oxide nanosheet/epoxy composites[J]. Journal of Materials Science, 2012, 47(3):1418-1426.
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