摘要
采用甲醛对煤沥青进行聚合改性,然后经热聚合工艺制备中间相炭微球(MCMB),并对MCMB的结构及性能进行了研究.采用偏光显微镜和XRD对MCMB的结构进行分析,采用SEM对所制备的MCMB形貌进行分析,采用TGA对MCMB的热行为进行分析.结果表明,所制备的MCMB收率达35.1%,其平均粒径约为10μm,MCMB表面聚集了粒径小于0.5μm的小球;粒径较小的MCMB在偏光显微镜下不呈现各向异性;MCMB的平均微晶层间距d002为0.3420nm,平均微晶高度Lc为3.42nm,平均微晶大小La为2.38nm;MCMB的5%(质量分数)热分解温度为618℃,整个过程的总失重率为15.12%.
Mesocarbon microbeads （MCMB） were prepared from coal-tar pitch by pyroly- sis condensation of coal-tar pitch modified with formaldehyde in the presence of oxalic acid. The structures of the MCMB were characterized by polarized light microscopy and XRD. The mor- phologies of the MCMB were analyzed using SEM, and the thermal behavior of the MCMB was studied by TGA. The results indicate that the yield of MCMB, which have the average size of 10μm, arrives at 35.1%. Moreover, there are a large number of microspheres with the size be- low 0.5μm congregate together on the surfaces of the MCMB. The MCMB with low particle size don＇t exhibit optical anisotropy under the polarized light microscopy. Furthermore, the interlay- er space （d002） and crystallite height and crystallite size of MCMB are 0. 342 0 nm, 3.42 nm, and 2.38 nm respectively. The characteristic degradation temperature at 5% mass loss is 618 ℃, and the total weight loss of the MCMB is 15.12%.
出处
《煤炭转化》
CAS
CSCD
北大核心
2009年第4期89-91,共3页
Coal Conversion
基金
国家自然科学基金资助项目(50802015)
福建省青年创新基金资助项目(2006F3067)
关键词
煤沥青
MCMB
制备
结构
coal-tar pitch, mesocarbon microbeads （MCMB）, preparation, structures
