添加氧化石墨烯对煤沥青成焦行为的影响

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

采用TEM观察添加异氰酸苯酯改性的氧化石墨烯(iGONSs)的微观结构,采用TGA研究添加iGONSs前后煤沥青的热解行为,采用偏光显微镜研究添加iGONSs前后煤沥青焦化产物的光学组织,采用XRD研究添加iGONSs对煤沥青焦化产物微晶结构的影响。研究表明,添加iGONSs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;iGONSs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iGONSs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。

Microstructure of the addition of phenyl isocyanatemodified graphene oxide nanosheets （iGONSs） was ex amined using transmission electron microscope（TEM） and physical adsorption analyzer, and thermal behaviors of the coaltar pitch with different iGONSs contents were investigated by thermogravimetric analysis （TGA）. In addition, the optical texture and microcrystal structure of resultant coke of the coaltar pitch with different iGONSs contents were characterized using reflected polarized light microscopy and Xray diffraction （XRD）, respectively. The results show that with the addition of iGONSs, the thermal stability of coaltar pitch increases, the weight loss temperature and coke value are improved. The addition of iGONSs plays a role in both the nucleation and the growth inhibition of carbona ceous mesophase, leading to a decrease in the anisotropic domain size of resultant cokes. With the increase in the a mount of iGONSs, the interlayer spacing of the coke increases, while its average crystallite height and average crystal lite width decrease.