전자선 조사와 열압축공정을 이용한 PAN 나노섬유의안정화 및 특성분석
Stabilization of PAN Nanofibers Using Electron Beam Irradiation and Thermal Compression Technique
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Polyacrylonitrile (PAN)-based carbon fibers have been widely used due to their uniquechemical, electrical, and mechanical properties. Electron beam irradiation has been extensivelyemployed as means of altering properties of polymeric materials. Electron beam irradiation caninduce chemical reactions in materials without any catalyst. Electron beam irradiation may be usefulin accelerating the thermal compression stabilization of PAN nanofibers. To investigate the irradiationeffect on PAN fibers, PAN nanofibers were irradiated by electron beam at 1,000~5,000kGy. Irradiated and non-irradiated PAN nanofibers were heated at 180 and 220C without applyingpressure for 15 min. Then 1 metric ton has been applied for 5 min. SEM images have been foundthat the fiber kept its morphological behavior after the hot pressing up to electron beam irradiated1,000 kGy. DSC thermograms showed that the peak temperatures of the exothermic reactions werefound to decrease with increasing electron beam irradiation doses and temperature. FT-IR spectrahave been found to decrease C≡N stretch band with increasing the electron beam irradiationdose. These results indicate that the modification of PAN via reactions such as cyclization is significantlyenhanced by electron beam irradiation and thermal compression technique.
Abstract
Polyacrylonitrile (PAN)-based carbon fibers have been widely used due to their uniquechemical, electrical, and mechanical properties. Electron beam irradiation has been extensivelyemployed as means of altering properties of polymeric materials. Electron beam irradiation caninduce chemical reactions in materials without any catalyst. Electron beam irradiation may be usefulin accelerating the thermal compression stabilization of PAN nanofibers. To investigate the irradiationeffect on PAN fibers, PAN nanofibers were irradiated by electron beam at 1,000~5,000kGy. Irradiated and non-irradiated PAN nanofibers were heated at 180 and 220C without applyingpressure for 15 min. Then 1 metric ton has been applied for 5 min. SEM images have been foundthat the fiber kept its morphological behavior after the hot pressing up to electron beam irradiated1,000 kGy. DSC thermograms showed that the peak temperatures of the exothermic reactions werefound to decrease with increasing electron beam irradiation doses and temperature. FT-IR spectrahave been found to decrease C≡N stretch band with increasing the electron beam irradiationdose. These results indicate that the modification of PAN via reactions such as cyclization is significantlyenhanced by electron beam irradiation and thermal compression technique.
참고문헌 (7)
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