Kil, Hyun-Sig Oh, Kyungae Kim, Young-Jin Ko, Seunghyun Jeon, Young Pyo Joh, Han-Ik Kim, Young-Kwan Lee, Sungho 2024-01-19T21:32:20Z 2024-01-19T21:32:20Z 2021-09-04 2018-11 0165-2370 https://pubs.kist.re.kr/handle/201004/120760 Isotropic pitch-based carbon fibers (IPCFs) were prepared at various carbonization temperatures from 400 to 1200 degrees C using pitch fibers stabilized at 290 degrees C to investigate their structural evolution during the carbonization process. The chemical structure changes of IPCFs as a function of carbonization temperature were thoroughly analyzed using various characterization tools, such as Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and laser desorption/ionization time-of-flight mass spectrometry. The characterization results were systematically compared with those of the ordering structures obtained from Raman spectroscopy and X-ray diffraction. The results demonstrated that the transformation of the chemical structure, ordering structure, and physical properties of IPCFs proceeds with three distinct steps depending on the carbonization temperature: fusion of small aromatic structures of pitch, random stacking of the fused structure and conversion into mostly disordered carbon structures. In addition, we found a correlation of the chemical and ordering structure changes with the enhancement of physical properties, such as density, tensile modulus, and strength. English ELSEVIER SCIENCE BV CARBON-FIBERS MECHANICAL-PROPERTIES STABILIZATION PRECURSORS CHAR TAR Structural evolution of pitch fibers during low temperature carbonization Article 10.1016/j.jaap.2018.10.010 1 JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, v.136, pp.153 - 159 JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS 136 153 159 scie scopus 000453301400018 2-s2.0-85055139060 Chemistry, Analytical Energy & Fuels Engineering, Chemical Chemistry Energy & Fuels Engineering Article CARBON-FIBERS MECHANICAL-PROPERTIES STABILIZATION PRECURSORS CHAR TAR Isotropic pitch Carbonization Tensile properties Raman spectroscopy Mass spectroscopy