Journal
CARBON
Volume 199, Issue -, Pages 288-299Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2022.08.033
Keywords
Mesophase pitch; Carbon fiber; Microstructure; SAXS
Funding
- Korean Institute of Science and Technology (KIST) Institutional Program [2E31904]
- JBNU-KIST Convergence Research Program [2Z06542]
- National R & D Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [10083586]
- Car- bon Cluster Development Program
- Ministry of Trade, Industry and Energy, Republic of Korea
- [2021M3H4A1A03041296]
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A recent study utilized small-angle X-ray scattering to analyze the carbonization process of pitch-derived fibers and found that there are three stages below 600°C, with the maximum softness achieved at 500°C.
Despite extensive studies on structural changes during the carbonization process of pitch-derived fibers, an ac-curate description of the transformation from liquid crystalline domains into carbon crystallites is still limited to a few depictions based on common analytical tools for carbon fibers. We employed small-angle X-ray scattering (SAXS) with model fits for the unification of such disparate measures. The carbonization process below 1200 ? is divided into three sequential regimes: Regime I -disruption of stacked polyaromatic mesogens with fluctuations in elasticity from 300 to 600 ?; Regime II -full-scale transformation with enhancement in orientation from 600 to 800 ?; and Regime III -development of semi-crystalline carbon structures with elongation of microvoids from 800 to 1200 ?. By examining the viscoelastic properties of pitch-derived fibers during heat treatment below 600 ? (Regime I), we found that the maximum softness of the pitch-derived fibers is achieved at 500 ?. This is due to the decrease in crosslink density between stacking structures, indicating that the crosslink density below 600 & DEG;C is a significant contributor to the formation of carbon crystallites.
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