磺化聚芳醚酮砜的热降解动力学

The Thermal Degradation Kinetics of Sulfonated Poly(Aryl Ether Ketone Sulfone)

通过热重分析仪(TGA)对作为质子交换膜材料使用的磺化聚芳醚酮砜(SPAEKS)进行了热性能研究。采用不同的升温速率,分别用Kissinger方法和Flynn-Wall-Ozawa方法研究了不同磺化度的SPAEKS在氮气氛围下磺酸基团完全脱落前的热降解动力学。研究表明,通过Kissinger方法计算得到SPAEKS的活化能E、指前因子A、反应级数n、相关系数r(磺化度0.8的SPAEKS-4,E=149.16 kJ/mol,lnA=23.93,n=2.6,r=0.9887)。通过Flynn-Wall-Ozawa方法计算得到SPAEKS的平均活化能E(SPAEKS-4的活化能为140.73 kJ/mol),而且所求活化能在相同磺化度下略低于用Kissinger方法所求,但活化能都随着磺化度的增加而增大。

The thermal behaviors of sulfonated poly（aryl ether ketone sulfone）（SPAEKS） as a proton exchange membrane materials was researched by thermogravimetry analysis（TGA）.The thermal degradation kinetics of SPAEKS before sulfonic acid groups completely splitting off was investigated at different heating rates in N2 by Kissinger method and Flynn-Wall-Ozawa method.The activation energy E,pre-exponential factor A,reaction order n and correlation coefficient r of SPAEKS with different degrees of sulfonation（DS） were calculated by Kissinger method（E,lnA,n and r of SPAEKS-4 are 149.16 kJ/mol, 23.93,2.6 and 0.9887,respectively）.The activation energy E of SPAEKS with different DS was calculated by Flynn-Wall-Ozawa method（E of SPAEKS-4 is 140.73 kJ/mol）,which is lower than that was calculation by Kissinger method in the same DS.The calculated activation energy of SPAEKS by above two methods increases with the increasment of DS.