碳纳米管_共聚酰亚胺复合膜...间断裂韧性和导热性(英文)_张丽丽.pdf
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1、Cite this:NewCarbonMaterials,2023,38(3):566-575DOI:10.1016/S1872-5805(23)60738-3Increasing the interlaminar fracture toughness and thermal conduc-tivity of carbon fiber/epoxy composites interleaved withcarbon nanotube/polyimide composite filmsZHANGLi-li1,2,3,LIXin-lian1,3,WANGPeng1,3,WEIXing-hai1,3,
2、JINGDe-qi1,3,ZHANGXing-hua1,3,ZHANGShou-chun1,2,3,*(1.Research Center of Advanced Thermoplastic Composites Engineering,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;2.Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,
3、Beijing 100049,China;3.CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Science,Taiyuan 030001,China)Abstract:Carbonfiber/epoxy(CF/EP)compositesarewidelyusedintheaerospaceindustry,buttheirinterlaminarpropertiesandout-of-planethermalconductivityarepoorbecauseofthe
4、lackofCFreinforcementintheinterlaminararea.Wepreparedcarbonnan-otube/polyimide(CNT/PI)compositefilmsandusedthemtoimprovetheinterlaminarfracturetoughness(ILFT)andthermalcon-ductivityoflaminatesofCF/EPandCNT/PI.InterleavingCNT/PIfilmswithunidirectionalCF/EPprepregsincreasedthemodeI(thepre-crackedlamin
5、atefailureisgovernedbypeelforces)andmodeII(thecrackispropagatedbyshearstresses)ILFTofCF/EPlaminatesby260%and220%,respectively,whichisattributedtothereinforcementeffectoftheCNTsandtheplasticdeformationofPIfilm.Inaddition,theout-of-planethermalconductivityofthelaminatesisimprovedbyintroducingCNT/PIfil
6、msbecauseoftheirintrinsichighthermalconductivityandthecontinuousconductivenetworkofCNTs.ThistougheningmethodprovidesaneffectivestrategyforimprovingthethermalconductivityandmechanicalpropertiesofCF/EPlaminatessimultaneously.Key words:CNT/BOHfilm;ILFT;Thermalconductivity;CF/EPlaminates;Thermalconducti
7、venetwork1IntroductionCarbonfiber/epoxy(CF/EP)laminateshavebeenwidelyusedinaerospace,defenseandautomotivein-dustries because of their excellent specific strengthandstiffness13.However,owingtothelackofCFre-inforcementintheinterlaminararea,theout-of-planethermal conductivity and interlaminar propertie
8、s arepoor,limiting their applications in many fields45.Moreover,tomeettherequirementofadvancedap-plications,thedevelopmentofhigh-performanceandstructure-function integration are trending researchtopicsforcarbonfiberreinforcedpolymers67.Itisimportanttoenhancetheinterlaminarfracturetough-ness(ILFT)and
9、thermalconductivityofthelaminateswithoutscarifyingtheotherstaticmechanicalproper-ties89.To simultaneously achieve high-performancestructuralcompositesandsatisfytheheatdissipationrequirement,introducing nano materials into CF/EPcomposites has bcome the subject of focus1013.Inparticular,carbonnanotube
10、s(CNTs)asafunctionalsecondphasehasbeenextensivelyinvestigated1419.Forinstance,Quanetal.20introduced1.0%CNTsin-totheepoxymatrix,andthemodeIILFT(GIC)ofCF/EPcompositeswasimprovedby25%.Prasadetal.21usedCNTsandpoly(ethersulfone)togetherastoughenersinepoxymatrixforenhancingthetough-nessofCF/EPlaminates.Ya
11、oetal.22depositedCNTsoncarbonfibersurfacetoenhancetheinterfacialad-hesion,theinterlaminarshearstress(ILSS)andGICofmodifiedlaminateswere32%and95%higherthanthatofthecontrolsample.Althoughtheresearchforaddingnanomaterialsintomatrixresinshasreachedgreaterheights,theunsatisfactorydispersionofnano-sizedse
12、condphaseandincreasedviscosityofmodi-fiedmatrixresinremaininsurmountableproblems.The interleaving method is a kind of effectiveandsimplewaytoimprovetheILFTwithoutincreas-ing viscosity of matrix resin.Li et al.23 fabricatedcontinuousandrandomlydistributedCNTsbyfloat-Received date:2023-02-10;Revised d
13、ate:2023-04-06Corresponding author:ZHANGShou-chun,Professor.E-mail:Author introduction:ZHANGLi-li,Ph.Dcandidate.E-mail:Supplementarydataassociatedwiththisarticlecanbefoundintheonlineversion.第38卷第3期新型炭材料(中英文)Vol.38No.32023年6月NEWCARBONMATERIALSJun.2023ingcatalyticchemicalvapordepositionmethodtoim-prov
14、etheILFFTofCF/EPlaminates.ThemaximumGICundertensileloadingistwicethatofthecontrolsample.Khan et al.24 investigated the effects ofbuckypaperonILFTofCF/EPlaminatesandfound31%and 104%enhancement in ILSS and GIIC,re-spectively.Ouetal.25demonstratedimprovementsof60%inGICbyinterleavingCNTsveilsinCF/EPlam-
15、inates.Shin et al.26 prepared CNTs/epoxy filmsthroughthree-rollmillingandultrasonicationmethodtotoughenCF/EPlaminates,andtheGIICofunidirec-tionalCF/EPlaminatesincreasedby126.7%afterin-terleaving 3%(mass fraction)CNTs/epoxy film.However,insertingpureCNTslayersorCNTs/epoxyfilmintothecarbonfiber/epoxyl
16、aminatesispronetocausestress concentration,limiting the further im-provementofILFT.Moreover,Kaynanetal.27repor-ted2-foldincrementinmixed-modeI/IIILFTbyin-troducingCNTs/polyvinylbutyralnanofibrousinter-leaves.Althoughthenanofibrousinterleavescanim-provetheILFTeffectively,thehighequipmentcoststilllimi
17、tstheircommercialapplication.Inaddition,mostresearches unfortunately focused on the en-hancementofILFTonlyanddidnotpayenoughat-tentiontothethermalconductivityofCF/EPlamin-ates.Inourpreviouswork28,hydroxyl-functionalizedpolyimideBPADA-ODA/HAB(BOH)was synthes-izedastoughenerfortetrafunctionalepoxyresi
18、nandshowedexcellenttougheningeffect,whichisattrib-utedtothenano-sizedphaseseparationandtheprop-erdecrementofcrosslinkingdensityofepoxyresin.Inthiswork,CNT/BOHhybridfilmswerepreparedasinterleavestoimprovetheILFTandthermalconduct-ivityofCF/EPlaminates.TheeffectsofCNTscon-tentinCNT/BOHfilmsonthemodeIan
19、dmodeIIIL-FT,flexural strength and through-thickness thermalconductivitywereinvestigated.Theexperimentalres-ults show that interleaving the laminates withCNT/BOH films increase GIC and GIIC values by260%and 220%,respectively.In addition,thethrough-thicknessthermalconductivityofCF/EPlam-inatesareimpr
20、ovedby32%throughtheintroductionofCNT/BOHfilms.2Experimental 2.1 MaterialMultiwall carbon nanotubes(MWCNTs,purityof95%,diameterof10-20nm,lengthof10-30m)werepurchasedfromChengduOrganicChemistryCo.Ltd.,China.BPADA-ODA/HAB(BOH)were syn-thesized in our laboratory.1-Methyl-2-pyrrolidinone(NMP)waspurchased
21、fromAladdinChemicalCor-poration.The unidirectional carbon fiber reinforcedtetrafunctionalepoxy resin prepregs were manufac-turedbyTianjinHansortCo.,Ltd,thespecificationsofprepregsareshowninTable1.2.2 Preparation of CNT/BOH interleavesCNTswerepurifiedwithHClandacidifiedbymixture reagent of concentrat
22、ed sulfuric acid/nitricacidtointroducecarboxylgroups,thedetailsofwhichare presented in Fig.S1.Then the acidified CNTsweredispersedinNMPusinganultrasonicprobefor20min.Afterthat,BOHpowderswereaddedtoformmixture,inwhichthesolidcontentis1%.Themix-ture was ultrasonically treated and casted on cleanglassp
23、latebymetalroller,thendriedintheovenat100 C for 48 h to remove solvent.After that,theCNT/BOHfilmswiththicknessof7mwerepeeledoffglassplatebyimmersedinboileddistilledwater.FilmswithdifferentCNTscontentwereobtainedbychanging the CNTs loading and denoted as BOH-x%CNT,inwhichxisthemasspercentageofCNTsinC
24、NT/BOHfilm.2.3 Fabrication of CF/EP laminatesFor the control specimen,32 plies of CF/EPprepregswithsizeof260mm210mmwerelamin-ated.A poly tetra fluoroethylene(PTFE)film withTable 1 Specifications of unidirectional carbonfiber/epoxy prepregsParameterSpecificationsCarbonfiberT700Resincontent/%382Areade
25、nsity/(g/m2)1503Thicknessofprepreg/mm0.11EpoxyresinHansort6320Tgofepoxyresin/C210Tensilestrengthofepoxyresin/MPa75Longitudinaltensilestrengthof1900第3期ZHANGLi-lietal:Increasingtheinterlaminarfracturetoughnessandthermalconductivity567thicknessof13mwasplacedbetweenthe15thand16th layer of the prepregs t
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