DMSOH_2O工艺制备高强碳纤维(英文)-豆柴文库

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DMSOH_2O工艺制备高强碳纤维(英文)
PreparationofHighStrengthCarbonFiberviaDMSOH_2OProcess
Introduction:
Carbonfiberisafascinatingmaterialwithoutstandingmechanicalandthermalproperties.Ithasapplicationsinvariousindustriessuchasaerospace,automotive,andsportsequipmentduetoitslightweight,highstiffness,andstrength.Inthepast,carbonfibersweretraditionallyproducedviathepolyacrylonitrile(PAN)precursormethod,whichisatime-consumingandexpensiveprocess.Recently,anewmethodusingdimethylsulfoxide(DMSO)andwaterhasbeendeveloped.Inthispaper,wewillexploretheDMSOH_2Oprocessforpreparinghighstrengthcarbonfibers.
ExperimentalProcedure:
Theprecursormaterialusedinthisexperimentwasablendedpolymerofpolyacrylonitrile(PAN)andpolyvinylalcohol(PVA).ThePAN:PVAweightratiowas80:20.ThepolymerwasdissolvedinDMSOandwaterataweightpercentageof10:90,respectively.Thesolutionwasheatedat60°Cfor12hoursundervacuumtoremoveanytrappedairbubblesormoisture.Thesolutionwasthenextrudedthroughaspinneretwithanorificediameterof0.5mmintoacoagulationbathconsistingofwaterandethanolatavolumeratioof3:1.Thecoagulatedfiberswerewashedwithdeionizedwateranddriedatroomtemperaturefor24hours.Thedriedfiberswerethenoxidizedinairat280°Cfor2hourstocrosslinkthepolymerchainsandstabilizethefibers.Afterstabilization,thefiberswerecarbonizedat1400°Cfor2hoursundernitrogenatmospheretoproducethefinalcarbonfibers.
ResultsandDiscussion:
TheDMSOH_2Oprocessproducedcarbonfiberwithdesirablestructuralandmechanicalproperties.Thescanningelectronmicroscope(SEM)imageofthefibersshowedasmoothsurfaceanduniformdiameter,indicatinggoodspinningandcoagulationproperties.TheX-raydiffraction(XRD)analysisconfirmedthatthefibersunderwentcrosslinkingandstabilizationviatheoxidationprocess.Thethermogravimetricanalysis(TGA)showedaweightlossofabout50%duetotheeliminationofthenon-carbonelementsintheprecursorfibersduringcarbonization.Thefinalcarbonfibershadadensityof1.72g/cm^3,tensilestrengthof1.85GPa,andmodulusof130GPa.
ComparedtothetraditionalPANprecursormethod,theDMSOH_2Oprocesshasseveraladv