Influence of Thermal Temperature on the Structure and Sealed Micropores of Stabilized Polyacrylonitrile Fibers-中国Betway体育网页登陆

摘要 Thermalstabilizationisanimportantprocessincarbonfibers＇production,duringwhichthepolyacryloni-trilefibersareheatedfrom180℃to280℃inair.Inthisstudy,thesampleswerecharacterizedbyX-raydiffraction,Fourierinfraredspectroscopy,differentialscanningcalorimetry,smallangleX-rayScattering（SAXS）andmechanicaltensiletests.Anewrulewassuggestedbytheresultsofstructuralcharacterizationforthecyclization,dehydrogena-tionandoxidationreactionsthatwereobservedtobedrasticfrom200℃to220℃,from220℃to250℃,andinthelaterperiodofthethermalstabilizationreactions,respectively.Thesizes,shapesanddistributionsofthesealedmicroporeswereobtainedfromtheSAXSdata.Thebreakingelongationwassignificantlyaffectedbythedrasticcyclizationanddehydrogenationreactions.Thebreakingforcewasaffectedconsiderablybythebiggermicropores,especiallyfrom220℃to250℃,owingtothedrasticdehydrogenationreactions.

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Influence of Thermal Temperature on the Structure and Sealed Micropores of Stabilized Polyacrylonitrile Fibers

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