Yoo, Seung Hwa Park, Sejoon Park, Youngkyu Lee, Donggyun Joh, Han-Ik Shin, Ickgy Lee, Sungho 2024-01-20T01:03:24Z 2024-01-20T01:03:24Z 2021-09-05 2017-07 0008-6223 https://pubs.kist.re.kr/handle/201004/122565 An electron-beam was irradiated on textile-grade polyacrylonitrile (PAN) fibers at various electron doses (200, 500, 1000, and 1500 kGy) prior to the thermal stabilization to fabricate carbon fibers (CFs). Textile-grade PAN fibers experienced superficial fusion between filaments during the thermal stabilization due to a large amount of co-monomer contents. However, electron-beam irradiation prior to thermal stabilization prevented the superficial fusion. Furthermore, the total stabilization time required to achieve the same degree of stabilization was effectively reduced as 64% by electron-beam irradiation. Various radicals were formed within textile-grade PAN fibers and they were recombined to crosslink with each other by gradually increasing the temperature. As a result, the elongation of irradiated fibers was suppressed and the glass transition temperature shifted to higher temperatures compared with the pristine fiber by increasing the electron dose. On the other hand, the onset and peak temperature of cyclization reaction for irradiated fibers were shifted to lower temperatures which indicated that the cyclization reaction was initiated at lower temperatures than pristine fibers. The tensile strength, Young's modulus, and strain-to-failure of resulting CFs were 1.83 +/- 0.23 GPa, 147.44 +/- 4.55 GPa, and 1.30 +/- 0.15%, respectively. (C) 2017 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD PAN FIBERS PRECURSORS COPOLYMERIZATION CARBONIZATION PERFORMANCE RADIATION EFFICIENT POLYMERS CHLORIDE Facile method to fabricate carbon fibers from textile-grade polyacrylonitrile fibers based on electron-beam irradiation and its effect on the subsequent thermal stabilization process Article 10.1016/j.carbon.2017.03.039 1 CARBON, v.118, pp.106 - 113 CARBON 118 106 113 scie scopus 000401120800013 2-s2.0-85015412737 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article PAN FIBERS PRECURSORS COPOLYMERIZATION CARBONIZATION PERFORMANCE RADIATION EFFICIENT POLYMERS CHLORIDE carbon fiber polyacrylonitrile electron beam stabilization