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Ultrafinepolyacrylonitrile(PAN)fibers,asaprecursorofcarbonnanofibers,withdiametersintherangeof220–760nmwereobtainedbyelectrospinningofPANsolutionusingN,N-dimethylformamide(DMF)assolvent.Morphologyofthenanofibersforvaryingconcentrationandappliedvoltagewasinvestigatedbyfieldemissionscanningelectronmicroscopy(FESEM).Thethermalpropertiesandstructuralchangesduringtheoxidativestabilizationprocesswereprimarilyinvestigatedbydifferentialscanningcalorimetry(DSC),thermogravimetricanalysis(TGA),andFouriertransforminfrared(FT–IR)spectroscopy. |
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