Yu, Sung-Uk Park, Sejoon Joh, Han-Ik Lee, Sungho Kim, Hwan Chul Bang, Yun-Hyuk Ku, Bon-Cheol 2024-01-20T03:02:21Z 2024-01-20T03:02:21Z 2021-09-05 2016-11 0379-153X https://pubs.kist.re.kr/handle/201004/123487 In this study, we investigated stepwise stabilization process of 48 k filaments PAN precursor to observe thermal behavior of PAN fibers. We also controlled parameters such as oven temperature, air flow direction, velocity, thermal residence time, and tow size to optimize stabilization process for large tow carbon fibers. FTIR, elemental analyzer, density column, X-ray diffractometer were used to evaluate stabilization degree and chemical structural evolution during thermal stabilization. The oxidation process of PAN fibers makes cross-linking reaction more easier between intermolecular chains and enduces cyclization reaction of acrylonitrile. In addition, the degree of air diffusion into fibers affects the mechanical properties of the final carbon fiber. The carbon fiber with ca. 10% of oxygen content and 1.40 g/cm(3) of density showed the best mechanical properties with 2.5 GPa tensile strength and 214 GPa tensile modulus. Korean POLYMER SOC KOREA POLYACRYLONITRILE PRECURSORS Thermal Behavior in Stabilization of Large Tow PAN-based Carbon Fiber Article 10.7317/pk.2016.40.6.972 1 POLYMER-KOREA, v.40, no.6, pp.972 - 976 POLYMER-KOREA 40 6 972 976 scie scopus kci ART002165360 000389393600020 2-s2.0-85009268691 Polymer Science Polymer Science Article POLYACRYLONITRILE PRECURSORS carbon fiber stabilization mechanical properties large tow polyacrylonitrile (PAN)