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使用紫外、红外和核磁共振碳谱等方法对γ射线辐照后的PAN原丝化学结构变化进行了分析,并采用Kissinger动力学分析的方法对比了由于辐照造成的热稳定化反应进程的差异。结果表明:γ射线辐照后PAN原丝同时产生了环状共轭和线性共轭结构,其中线性共轭结构的生成使得热稳定化反应表观活化能增加,而指前因子提高,即辐照后的PAN原丝需要相对较高的热稳定化起始温度,而反应速率得以提高。
The changes of the chemical structure of PAN filaments irradiated by γ-rays were analyzed by ultraviolet, infrared and nuclear magnetic resonance (1H-NMR) spectroscopy. The Kissinger kinetic analysis was used to compare the difference of the thermal stabilization reaction due to irradiation . The results showed that both the cyclic conjugated and the linear conjugated structures of PAN precursors were produced by γ-ray irradiation. The formation of linear conjugate structure increased the apparent activation energy of the thermal stabilization reaction while the pre-exponential factor increased The irradiated PAN filaments require a relatively high starting temperature for thermal stabilization and the reaction rate is increased.