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8244059 
Journal Article 
高温煤沥青不同组分中间相形成过程 
Xu, L; Wang, XJ; Yang, T; Chi, YQ; Song, Y; Song, HH; Liu, ZJ 
2020 
Unk 
Xinxing Tancailiao
ISSN: 1007-8827 
Institute of Metal Research Chinese Academy of Sciences 
35 
5 
599-608 
Chinese 
High temperature coal tar pitch was extracted with n-hexane, toluene and pyridine to produce a N-heptane-soluble component (HS), a N-heptane insoluble-toluene soluble component (HI-TS), a toluene insoluble-pyridine soluble component (TI-PS) and a pyridine insoluble component (PI). Mesophase pitch was prepared by direct thermal polycondensation using HS, HI-TS, TI-PS as the raw materials. Polarizing microscopy was used to observe the microstructure of the three mesophases, and their contents were measured by extracting thermal polycondensation products with tetrahydrofuran. Results showed that with increasing reaction temperature from 400 °C to 460 °C, the HS tends to form mesophase pitch with larger anisotropic domains while the HI-TS and TI-PS produce flow-textured and mosaic structures with mesophase contents above 90%. © 2020, Science Press. All right reserved. 
Coal tar pith; Component of coal pitch; Mesophase content; Optical structure