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MaterialsandDesign31(2010)999–1002 ContentslistsavailableatScienceDirect MaterialsandDesign journalhomepage:www.elsevier.com/locate/matdes ShortCommunication Chemicalrecyclingofcarbonfibersreinforcedepoxyresincomposites inoxygeninsupercriticalwater YongpingBaia,ZhiWangb,*,LiqunFenga aSchoolofChemicalEngineeringandTechnology,HarbinInstituteofTechnology,Harbin150001,China bCenterforCompositeMaterials,HarbinInstituteofTechnology,Harbin150001,China articleinfoabstract Articlehistory:Thecarbonfibersincarbonfibersreinforcedepoxyresincompositeswererecoveredinoxygeninsuper- Received29June2009criticalwaterat30±1MPaand440±10°C.Themicrostructureoftherecoveredcarbonfiberswas Accepted30July2009observedusingscanningelectronmicroscopy(SEM)andatomforcemicroscopy(AFM).Theresults Availableonline3August2009 revealedthatthecleancarbonfiberswererecoveredandhadhighertensilestrengthrelativetothevirgin carbonfiberswhenthedecompositionratewasabove85wt.%,althoughtherecoveredcarbonfibershave cleansurface,theepoxyresinonthesurfaceoftherecoveredcarbonfiberswasreadilyobserved.Asthe decompositionrateincreasedtoabove96wt.%,noepoxyresinwasobservedonthesurfaceofthecarbon fibersandtheoxidationoftherecoveredcarbonfiberswasreadilymeasuredbyX-rayphotoelectron spectroscopy(XPS)analysis.Thecarbonfiberswereideallyrecoveredandhaveoriginalstrengthwhen thedecompositionrateswerebetween94and97wt.%.Thisstudyclearlyshowedtheoxygeninsuper- criticalwaterisapromisingwayforrecyclingthecarbonfibersincarbonfibersreinforcedresin composites. Ó2009ElsevierLtd.Allrightsreserved. 1.Introductionusingcatalyststoformamixtureoforganiccompositions [10,11].Unfortunately,theabove-mentionedmethodsresultin Carbonfibersreinforcedresinmatrixcompositesareaclassoftheformationofthelayercharornon-decomposedresinmatrix advancedmaterialsthathavebeendevelopedforavarietyofappli-ontherecoveredcarbonfibers. cationsinhigh-technologyfields,suchastheaerospaceandauto-Supercriticalfluidsandespeciallysupercriticalwater mobileindustries,aswellasinsportinggoo