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WAXD/SAXS study and 2D fitting (SAXS) of the microstructural evolution of PAN-based carbon fibers during the pre-oxidation and carbonization process
Li, XY; Tian, F; Gao, XP; Bian, FG; Li, XH; Wang, J
2017
Source PublicationNEW CARBON MATERIALS
ISSN1007-8827
Volume32Issue:2Pages:130-137
Subtype期刊论文
AbstractMicrostructutal evolution in polyacrylonitrile (PAN) fibers at different temperatures during pre-oxidation and carbonization under stretching was studied by. synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). Microvoids were characterized by the classical SAXS method, and were compared with simulation results obtained by fitting 2D SAXS patterns to a model based on a dilute system of cylindrical microvoids randomly distributed and preferentially orientated along the fiber axis and having a log-normal size distribution. The WAXD results showed that the crystal size, d-spacing and preferred orientation decreased during pre-oxidation, and increased during carbonization. A diffraction peak for PAN fibers at 2 theta = 13. 6 degrees disappeared during the final stage of pre-oxidation, meanwhile a new peak at 2 theta = 23.6 degrees appeared, whose intensity increased during carbonization, indicating the formation of the graphite structure. The average length of the microvoids increased, and new microvoids were formed, which became oriented along the fiber axis as the fiber manufacturing process proceeded. The length of microvoids from simulation results is consistent with that from the classical method, indicating that the model is valid to describe the microvoid structure of fibers.
KeywordWide-angle X-ray Scattering Small-angle X-ray Scattering Carbon Fiber Microvoids Direct Model Fitting
DOI10.1016/S1872-5805(17)60110-0
Indexed BySCI
Language英语
WOS IDWOS:000402223700005
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/27494
Collection中科院上海应用物理研究所2011-2018年
Recommended Citation
GB/T 7714
Li, XY,Tian, F,Gao, XP,et al. WAXD/SAXS study and 2D fitting (SAXS) of the microstructural evolution of PAN-based carbon fibers during the pre-oxidation and carbonization process[J]. NEW CARBON MATERIALS,2017,32(2):130-137.
APA Li, XY,Tian, F,Gao, XP,Bian, FG,Li, XH,&Wang, J.(2017).WAXD/SAXS study and 2D fitting (SAXS) of the microstructural evolution of PAN-based carbon fibers during the pre-oxidation and carbonization process.NEW CARBON MATERIALS,32(2),130-137.
MLA Li, XY,et al."WAXD/SAXS study and 2D fitting (SAXS) of the microstructural evolution of PAN-based carbon fibers during the pre-oxidation and carbonization process".NEW CARBON MATERIALS 32.2(2017):130-137.
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