高温煤沥青不同组分中间相形成过程

Formation of mesophase from the components of high temperature coal tar pitch

通过对高温煤沥青分级萃取获得了以下几种组分:正庚烷可溶物(HS)、正庚烷不溶甲苯可溶物(HI-TS)、甲苯不溶吡啶可溶物(TI-PS)及吡啶不溶物组分(PI),分别以HS、HI-TS和TI-PS组分为原料,采用直接热缩聚法,制备了中间相沥青。通过偏光显微镜观察,四氢呋喃提取中间相等方法对合成的中间相沥青进行结构表征和中间相含量分析。结果表明:当反应温度为400~460℃时,HS组分趋向于生成区域型光学结构的中间相沥青,而HI-TS,TI-PS组分则会随着反应温度、恒温时间的增加,生成流线型或镶嵌型中间相结构,且中间相含量均在90%以上。

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℃ to 460℃,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%.