煤系中间相成形过程中的共熔效应

A eutectic effect in the formation of coal based mesophase pitch

煤焦油沥青甲苯可溶物(TS)和废聚苯乙烯(WPS)共炭化生成的中间相沥青,性能得到很大改善。可溶性中间相的质量分数从10%提高到52%,光学结构从中间相体积分数65%的粗镶嵌结构改善为100%的广域融并体;表观黏度分析显示添加WPS后,中间相沥青从触变性变为非触变性。红外和核磁共振分析表明共炭化过程中发生烷基化反应,出现较多的α亚甲基结构。X射线衍射结果显示在添加WPS后使芳香平面分子取向排列变好。结果表明:共炭化过程中,烷基结构的增多是共熔效应发生的主要原因。

The toluene soluble part of coal tar pitch （TS） was co-carbonized with waste polystyrene （ WPS ） to produce mesophase pitch. Results showed that the properties of the mesophase were improved greatly due to the eutectic effect. The solubilities of the TS mesophase pitch and TS-WPS mesophase pitch were mass fraction of 10 and 52% respectively. The anisotropic, volume fractions of the TS mesophase pitch and TS-WPS mesophase pitch were 65% （coarse mosaic texture） and 100% （flow domain texture） respectively. Apparent viscosities showed that the mesophase pitch was changed from thixotropic to unthixotropic by adding WPS to TS. FT-IR and ^1H-NMR spectroscopy showed that an alkylation reaction took place accompanied by an increase of methylene groups when WPS was added to TS. The increase of alkyl groups led to an assembly of mesogen molecules, resulting in a eutectic effect.