Analysis of Microstructural Changes in Polyacrylonitrile-Based Carbon Fibers Caused by Isothermal Oxidation in Air 


Vol. 58,  No. 1, pp. 31-39, Feb.  2021
10.12772/TSE.2021.58.031


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  Abstract

In this study, isothermal oxidation reactions of polyacrylonitrile-based T300 and T700 carbon fibers were conducted in air at 700 °C by employing a horizontal tube furnace. The oxidized fibers were examined through XRD and micro-Raman analysis for quantitatively analyzing the changes in crystallinity occurring after the oxidation reactions. The results obtained from XRD analysis corroborate that the overall crystallinity of an oxidized fiber is lower than that of the corresponding raw fiber. Observation through a scanning electron microscope indicates that a longitudinal hollow pore is formed along the fiber axis of each oxidized fiber. Additionally, since the crystallinity of the fiber core is lower than that of the sheath, the conducted micro-Raman analysis suggests that the core became oxidized first to form the longitudinal hollow pore. In this study, it was difficult to measure the depth of the longitudinal hollow pore through the fiber core. In the future, if the depth of the hollow pore can be measured at the fiber core and is optimized for developing the hollow pore, new support materials, which serve as the carriers, can be designed.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)