改性氧化石墨烯对环氧树脂基复合材料热膨胀系数影响的研究
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摘要
环氧树脂(EP)热膨胀系数(CTE)为65×10~(-6)℃~(-1),碳纤维(CF)CTE为-12×10~(-6)℃~(-1),因此降低EP的CTE是提高碳纤维增强环氧树脂(CF/EP)复合材料低温使用性能的关键。采用氧化石墨烯(GO)和四氧化三铁改性氧化石墨烯(Fe_3O_4-GO)修饰EP,研究了GO及Fe_3O_4-GO对EP基体CTE的影响。结果表明:由于Fe_3O_4-GO表面的官能团可与EP基体形成共价键,从而加强了与EP基体的界面作用;相对于纯EP,GO和Fe_3O_4-GO改性EP的玻璃化转变温度(Tg)分别升高了3.71℃和5.74℃;相对于纯EP,GO和Fe_3O_4-GO改性EP在Tg下的CTE值分别降低了23.77%和33.61%,但在Tg上的CTE值均高于纯EP。
Coefficient of thermal expansion(CTE)of epoxy and carbon fiber are 65×10~(-6)℃~(-1) and-12×10~(-6)℃~(-1),respectively.CTE has a big influence on the property of carbon fiber reinforced epoxy laminate and how to decrease CTE value of epoxy matrix is the key to improve its property at cryogenic temperature.Graphene oxide(GO)and Fe_3O_4 modified graphene oxide(Fe_3O_4-GO)were applied to modified epoxy and its CTE value was studied.The results showed that covalent bond was formed between filler and epoxy,which strengthen the interfacial bonding between filler and epoxy matrix.Glass transition temperatures(Tg)of GO and Fe_3O_4-GO modified epoxy resin were all improved.In comparison to neat epoxy,CTE values of GO and Fe_3O_4-GO modified epoxy resin belowTgrange were decreased 23.77% and 33.61%,respectively,but CTE values of GO and Fe_3O_4-GO modified epoxy resin were all higher than neat epoxy when above Tgrange.
Coefficient of thermal expansion(CTE)of epoxy and carbon fiber are 65×10~(-6)℃~(-1) and-12×10~(-6)℃~(-1),respectively.CTE has a big influence on the property of carbon fiber reinforced epoxy laminate and how to decrease CTE value of epoxy matrix is the key to improve its property at cryogenic temperature.Graphene oxide(GO)and Fe_3O_4 modified graphene oxide(Fe_3O_4-GO)were applied to modified epoxy and its CTE value was studied.The results showed that covalent bond was formed between filler and epoxy,which strengthen the interfacial bonding between filler and epoxy matrix.Glass transition temperatures(Tg)of GO and Fe_3O_4-GO modified epoxy resin were all improved.In comparison to neat epoxy,CTE values of GO and Fe_3O_4-GO modified epoxy resin belowTgrange were decreased 23.77% and 33.61%,respectively,but CTE values of GO and Fe_3O_4-GO modified epoxy resin were all higher than neat epoxy when above Tgrange.
引文
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[3] Luo H L,Xiong G Y,Ma C Y,et al.Preparation and performance of long carbon fiber reinforced polyamide 6composites injection-molded from core/shell structured pellets[J].Materials and Design,2014,64:294-300.
[4] Swolfs Y,McMeeking R M,Verpoest I,et al.Matrix cracks around fibre breaks and their effect on stress redistribution and failure development in unidirectional composites[J].Composites Science and Technology,2015,108:16-22.
[5] Kalarikkal S G,Sankar B V,Ifju P G.Effect of cryogenic temperature on the fracture toughness of graphite/epoxy composites[J].Journal of Engineering Materials and Technology,2006,128(2):151-157.
[6]张丽,赫玉欣,杨松,等.改性氧化碳纳米管对环氧树脂基复合材料热膨胀系数的影响[J].塑料科技,2017,45(7):71-76.
[7] Bechel V T,Camping J D,Kim R Y.Cryogenic/elevated temperature cycling induced leakage paths in PMCs[J].Composites Part B,2005,36:171-182.
[8] Bansemir H,Haider O.Fiber composite structures for space applications-recent and future developments[J].Cryogenics,1998,38(1):51-59.
[9] Meng Q S,Wu H,Zhao Z H,et al.Free-standing,flexible,electrically conductive epoxy/graphene composite films[J].Composites:Part A,2017,92:42-50.
[10] Wei Chenyu,Srivastava Deepak,Cho Kyeongjae.Thermal expansion and diffusion coefficients of carbon nanotube-polymer composites[J].Nano Letters,2002,2(6):647-650.
[11]邓富泉,张丽,杨松,等.氧化石墨烯有序排列对碳纤维增强环氧树脂复合材料低温性能影响[J].高分子材料科学与工程,2017,33(7):38-44.
[12]赫玉欣,杨松,张丽,等.碳纳米管有序排列对碳纤维增强环氧树脂基复合材料低温性能的影响[J].复合材料学报,2017,34(8):98-108.
[13] Jiang Y,Sun R H,Zhang H B,et al.Graphene-coated ZnO tetrapod whiskers for thermally and electrically conductive epoxy composites[J].Composites:Part A,2017,94(1):104-112.
[14] He Y X,Li Q,Kuila T,et al.Micro-crack behavior of carbon fiber reinforced thermoplastic modified epoxy composites for cryogenic applications[J].Composites:Part B,2013,44:533-539.
[15] Thua T V,Sandhua A.Chemical synthesis of Fe3O4-graphene oxide nanohybrids as building blocks for magnetic and conductive membranes[J].Materials Science and Engineering B,2014,189:13-20.
[16] Deosarkara M P,Pawara S M,Bhanvase B A.In situ sonochemical synthesis of Fe3O4-graphene nanocompositefor lithium rechargeable batteries[J].Chemical Engineering and Processing,2014,83(1):49-55.
[17] Wang S R,Liang Z Y,Gonnet P,et al.Effect of nanotube functionalization on the coefficient of thermal expansion of nanocomposites[J].Advanced Functional Materials,2007,17(1):87-92.