添加氧化石墨烯对煤沥青成焦行为的影响

采用TEM观察添加异氰酸苯酯改性的氧化石墨烯( i GONSs)的微观结构，采用TGA研究添加iGONSs前后煤沥青的热解行为，采用偏光显微镜研究添加 i GONSs前后煤沥青焦化产物的光学组织，采用XRD研究添加 i GONSs对煤沥青焦化产物微晶结构的影响。研究表明，添加 i GONSs后，煤沥青的热分解温度变大，热失重率变小，其耐热性能变好； i GONSs对煤沥青碳质中间相的形成起到成核和抑制生长的作用，这使得最终焦化产物的光学各向异性单元尺寸变小；随着 i GONSs添加量的增加，焦化产物的微晶层间距增大，平均微晶高度和平均微晶宽度减小。

Effect of graphene oxide nanosheets addition on the coking behavior of coal-tar pitch

Microstructure of the addition of phenyl isocyanate modified graphene oxide nanosheets( i GONSs) was examined using transmission electron microscope(TEM) and physical adsorption analyzer，and thermal behaviors of the coal tar pitch with different i GONSs contents were investigated by thermogravimetric analysis(TGA).In addition，the optical texture and micro crystal structure of resultant coke of the coal tar pitch with different iGONSs contents were characterized using reflected polarized light microscopy and X ray diffraction(XRD)，respectively.The results show that with the addition of i GONSs，the thermal stability of coal tar pitch increases，the weight loss temperature and coke value are improved.The addition of i GONSs plays a role in both the nucleation and the growth inhibition of carbonaceous mesophase，leading to a decrease in the anisotropic domain size of resultant cokes.With the increase in the amount of i GONSs，the interlayer spacing of the coke increases，while its average crystallite height and average crystallite width decrease.