【作者】 邱英华； 王同华； 宋成文； 邱介山； 吴法宇； 成会明；

【Author】 Qiu Yinghua Wang Tonghua Song ChengwenQiu Jieshan Wu Fayu Cheng Huiming(Laboratory of Carbon Material, School of Chemical Engineering, Dalian University of Technology,Dalian 116012) ( Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang, 110016)

【机构】 大连理工大学化工学院炭素研究室； 中国科学院金属研究所沈阳材料科学国家联合实验室；

【摘要】 采用Raman、XRD技术研究了PAN在真空热解过程中形成炭膜时微观结构的变化,计算了其结构参数。结果表明,在真空热解过程中,随热解温度的升高,炭膜微晶结构在a轴方向得到发展,层间距不断增大,试样由线型有序结构转变为乱层石墨结构。根据Raman数据,由Arrhenius方程计算出PAN在真空条件下形成炭膜时热解反应活化能为2449.06 J/mol,指前因子为0.6599。通过对XRD参数的分析比较,探讨了PAN炭膜中孔结构的形成机理,构建了孔结构模型,并推断出炭膜孔尺寸大约为0.716 nm×0.738 nm×0.852 nm。更多还原

【Abstract】 The microstructure changes in formation of PAN-based carbon membrane during pyrolysis in vacuum were studied by the techniques of Raman and XRD. The structural parameters were also calculated. It shows that with the increase of temperature, the crystal grows along a axis direction and the d002 values increase. Meanwhile, the linear molecular structure transits to the turbostratic graphitic structure. According to Raman analysis, the graphite mole fraction was found to obey an Arrhenius relation with the pyrolysis temperature. The activation energy and the pre-exponential are 2449.06J/mol and 0.6599 respectively. The results of XRD analysis led us to investigate the mechanism of the formation of pore structure and propose a microstructure model of PAN-based. carbon membrane during pyroly- sis. This theoretical nanopore based on the model is approximately 0.716 nm× 0.738 nm×0.852 nm.更多还原