Sulfonated Poly Aryl Ether Ketone Sulfone Thermal Degradation Kinetics

Research on the thermal behaviors of sulfonated poly(aryl ether ketone sulfone)(SPAEKS) as a proton exchange membrane materials by thermogravimetry analysis(TGA). The thermal degradation kinetics of sulfonated poly(aryl ether ketone sulfone)(SPAEKS) before sulfonic acid groups completely splitting off were investigated at different heating rates in N2 by Kissinger method,Flynn-Wall-Ozawa method and Friedman method. The activation energy E, pre-exponential factor A, reaction order n and correlation coefficient r of SPAEKS with different degrees of sulfonation were calculated by above three methods. The results showed that the activation energy is not directly related to the reaction order changing. Calculated the activation energy of SPAEKS by Kissinger method and Flynn-Wall-Ozawa method increased with the increasing of sulfonation degree.Research on the thermal behaviors of sulfonated poly(aryl ether ketone sulfone) as a proton exchange membrane materials by thermogravimetry analysis(TGA). The results showed that the chain of SPAEKS easily fracture in air. The thermal degradation kinetics of SPAEKS before sulfonic acid groups completely splitting off were investigated at different heating rates by Kissinger method^ Flynn-Wall-Ozawa method and Friedman method. The activation energy E, pre-exponential factor A, reaction order n and correlation coefficient r of SPAEKS were calculated by above three methods. The results showed that the activation energy E by Flynn-Wall-Ozawa method and by Friedman method lower than by Kissinger method in the same ambience; the activation energy E by Kissinger method and Flynn-Wall-Ozawa method in air lower than in N2.We found the life equations and solid-state processes of SPAEKS (with degrees of sulfonation is 0.8),it provides a theoretical basis to proton exchange membrane materials for use in specific temperature.