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(경북대학교 섬유공학과) (한양대학교 유기나노공학과) (한양대학교 유기나노공학과) (한양대학교 유기나노공학과)
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한국섬유공학회 한국섬유공학회지 한국섬유공학회지 제53권 제5호
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    초록·키워드

    Dynamic rheological properties of polyacrylonitrile (PAN)/dimethylformamide (DMF) solutions were measured at several different temperatures ($25-55^{\circ}C$), and their electrospinning was conducted at corresponding temperatures to prepare PAN precursor fibers. The electrospun fibers were subsequently converted to carbon nanofibers through a carbonization process and their physical properties such as electrical conductivity, morphology and crystal structure were examined with regard to the electrospinning temperature. The dynamic viscosity of PAN/DMF solutions decreased with increasing temperature, exhibiting a lower Newtonian flow region followed by shear thinning. In the Cole-Cole plot, the initial slope decreased with decreasing temperature but a single master curve of constant slope above the inflection point was observed regardless of the temperature. FESEM images showed that the diameter of the PAN precursor fibers and resulting carbon nanofibers decreased as the electrospinning temperature increased. The diffraction peak of carbon nanofiber in the WAXD pattern was shifted from 22 to $24^{\circ}$. Further, Raman spectroscopy showed that the graphitic carbon peak at $1600cm^{-1}$ increased with increasing electrospinning temperature. In addition, the electrical conductivity of the carbon nanofiber increased considerably from 2.95 to 6.15 S/cm with increasing electrospinning temperature from 25 to $55^{\circ}C$.

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