将煤沥青(CTP)与邻苯二甲酸二辛酯(DOP)共炭化,研究了DOP同CTP共炭化对成焦结构产生的影响、热行为及半焦的电化学性质.共炭化所得焦化产物的显微结构分别用偏光显微镜、XRD和扫描电镜进行了观察;电化学性质和热行为分别采用电化学工作站和热重分析仪进行了研究.热重分析表明,DOP与CTP共炭化过程中失重速率变慢,说明期间发生了进一步的聚合反应,提高了聚合度;偏光显微镜和XRD分析表明,共炭化能够改善半焦结构的纤维组织,芳环的晶间有序堆积高度增大,晶面层间距离缩小;SEM进一步证实了共炭化过程有序性微晶结构的存在.同炭化CTP得到的半焦电化学性质相比,共炭化得到的半焦电子传输活性增大,有利于提高炭材料的电性能.
Coal tar pitch ( CTP) and dioctyl phthalate ( DOP) were co-carbonized and the effects of the DOP addition on the ther-mal behavior of CTP, and the microstructures and electrochemical properties of semi-cokes derived from it were investigated by TGA, polarized light microscopy, SEM, XRD and electrochemical impedance spectroscopy ( EIS) . Results indicate that the weight loss rates of mixtures of CTP and DOP are slower than that of CTP, indicating that polycondensation between CTP and DOP takes place during co-carbonization. The Lc values of the CTP-DOP cokes are larger while their d002 values are smaller than those of the CTP coke. The electrical conductivities of the CTP-DOP cokes are better than that of the CTP coke as revealed by EIS.
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