PAN基碳纤维碳化过程反应动力学研究

Kinetics analysis of the PAN based carbon fiber during carbonization

使用热失重分析(TGA)模拟了聚丙烯腈(PAN)预氧纤维在N2气氛中的碳化反应,并使用Kissinger和Ozawa法计算了碳化反应动力学相关参数。在室温～1400℃范围内,碳化反应可以分为三个阶段顺序进行,而且均符合一级反应级数模型。3步反应的活化能值Ea3>Ea2>Ea1,幂前指数A1>A3>A2,反应速率R1>R2>R3。分析表明:环化结构重排的化学反应是碳化步骤的控制反应。

The carbonization process of the PAN stabilized fiber in N2 were simulated using thermogravimetry anal- ysis（TGA）. The kinetics parameters for the carbonization were calculated by the Kissinger and Ozawa method. It was found that when up to 1400℃, the carbonization can be divided into three stages, which were all coincide with the one order reaction module. The order of the activation energy for these three reaction were Ea3 〉Ea2〉Eal, for pre-exponential factor were A1〉A3 〉A2, for the reaction rate were R1 〉 R2 〉R3. The key reaction during the carbonization was the rearrangement of the cyclized structure.