期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 136, 期 -, 页码 153-159出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2018.10.010
关键词
Isotropic pitch; Carbonization; Tensile properties; Raman spectroscopy; Mass spectroscopy
资金
- Korea Institute of Science and Technology (KIST) Institutional Program
- Korea Evaluation Institute of Industrial Technology (KEIT) through the Carbon Cluster Construction project - Ministry of Trade, Industry & Energy (MOTIE, Republic of Korea) [10083586]
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.
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