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MaterialsandDesign31(2010)1613–1616 ContentslistsavailableatScienceDirect MaterialsandDesign journalhomepage:www.elsevier.com/locate/matdes ShortCommunication Interfacepropertiesofcarbonfiber/epoxyresincompositeimproved bysupercriticalwaterandoxygeninsupercriticalwater YongpingBaia,ZhiWangb,*,LiqunFenga aSchoolofChemicalEngineeringandTechnology,HarbinInstituteofTechnology,Harbin150001,China bCenterforCompositeMaterials,HarbinInstituteofTechnology,Harbin150001,China articleinfoabstract Articlehistory:Theinterfacepropertiesbetweenthecarbonfibersandepoxyresinwereimprovedbythesupercritical Received20June2009waterandoxygeninsupercriticalwaterbecausethesurfaceroughnessandthefunctionalgroupscon- Accepted2September2009tainingoxygenwereincreasedobviouslycomparedwiththatofuntreatedcarbonfibers.Thiswasfavor- Availableonline6September2009 abletoimprovementoftheadhesivestrengthbetweenthecarbonfibersandtheresin.ThemaximalIFSS ofthecarbonfiber/epoxyresincompositetreatedbythesupercriticalwaterandtheoxygeninsupercrit- icalwaterwere58.3and92.8MPa,respectively,whichincreasedbyapproximately10%and75%for 52.9MPaoftheuntreatedcarbonfiber/epoxyresincomposite. Ó2009ElsevierLtd.Allrightsreserved. 1.Introductionappliedtotheprocessofdecompositionofstabletoxicorganic wastesbecausethesupercriticalwaterhasahighsolubilityfor Carbonfibershaveauniquecombinationofoutstandingbothorganiccompound,andoxygenandwatercanformasingle mechanical,physicalandchemicalproperties,suchashighandhomogeneousphase,whichallowsoxidationtoproceedrap- strength,highmodulusandthermalresistance[1].Thecarbonfi-idlybyaneliminationofthepotentialinterfacemasstransport bersreinforcedresinmatrixcompositeshavebeenusedinaircraftlimitations[9–12].Nevertheless,uptodate,thereareonlyafew andspacestructures[2,3].Theperformanceofthesecompositespapersdevotedtotheinvestigationofthesupercriticalwatertreat- stronglydependsonthequalityofthefiber–matrixinterface,mentofthecarbonfibersurface,sincesupercriticalwateroxida- whichdeterminesthewayloadsc