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采用热重分析跟踪模拟中间相沥青纤维的氧化稳定化过程,研究升温速率、氧化终温及恒温时间对纤维氧化进程的影响,并在此基础上建立了氧化增重与反应时间和温度的关系。实验发现:在230～290℃空气中反应数小时稳定化能够完成,而且纤维的氧化增重量Δw与反应时间t0.3成很好的线性关系。通过Arrhenius方程拟合计算出不同温度下的动力学参数及活化能,确立了简单而精确的氧化增重与时间及温度的动力学模型,从而可准确把握和预测中间相沥青纤维在恒温空气下氧化增重的进程,实现稳定化。
The thermogravimetric analysis was used to trace the oxidation stabilization process of mesophase pitch fibers. The effects of heating rate, final oxidation temperature and constant temperature on the oxidation process of fiber were investigated. Based on these, the relationship between oxidation weight gain and reaction time and temperature was established . The experimental results show that the stabilization in air at 230 ~ 290 ℃ for several hours can be completed, and the weight gain Δw of the fiber has a good linear relationship with the reaction time t0.3. The kinetic parameters and activation energies at different temperatures were calculated by Arrhenius equation fitting, and a simple and accurate kinetic model of oxidation weight gain and time and temperature was established, which can accurately predict and predict mesophase pitch fiber under constant temperature air Oxidation of weight gain process, to achieve stabilization.