XRD와 마이크로 라만 분석을 이용하여 700 oC 공기 중에 서 등온 산화된 PAN계 탄소섬유의 미세구조 변화 해석

Abstract

In this study, isothermal oxidation reactions of polyacrylonitrile-based T300 andT700 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 quantitativelyanalyzing the changes in crystallinity occurring after the oxidation reactions. Theresults obtained from XRD analysis corroborate that the overall crystallinity of an oxidizedfiber is lower than that of the corresponding raw fiber. Observation through a scanningelectron microscope indicates that a longitudinal hollow pore is formed along the fiber axisof each oxidized fiber. Additionally, since the crystallinity of the fiber core is lower than thatof the sheath, the conducted micro-Raman analysis suggests that the core became oxidizedfirst to form the longitudinal hollow pore. In this study, it was difficult to measure thedepth of the longitudinal hollow pore through the fiber core. In the future, if the depth ofthe hollow pore can be measured at the fiber core and is optimized for developing the hollowpore, new support materials, which serve as the carriers, can be designed.