SIS-g-BMA热降解动力学研究

采用热重分析法和差示热重分析法研究苯乙烯-异戊二烯-苯乙烯三元嵌段共聚物(SIS)与甲基丙烯酸丁酯(BMA)的接枝共聚物(SIS-g-BMA)在氮气和氧气气氛中的热降解性能。结果表明，SIS-g-BMA在氮气气氛中第1步热降解温度范围为398～739 K，质量损失率为93.7%，最大热降解速率温度为658.2 K，第2步热降解温度范围为739～945 K，质量损失率为6.3%，平均活化能为176.1 kJ·mol^-1；在氧气气氛中第1步热降解温度范围为459～719 K，质量损失率为76.8%，第2步热降解温度范围为719～776 K，质量损失率为23.2%，最大热降解速率温度为735.0 K，平均活化能为51.75 kJ·mol^-1。;The thermal degradation of SIS-g-BMA in nitrogen and oxygen atmospheres was investigated by thermogravimetry and differential thermogravimetry.The results showed that in nitrogen atmosphere，the temperature range for the first stage of thermal degradation was 398～739 K，weight-loss rate was 93.7%，the temperature at the maximum thermal degradation rate was 658.2 K，the temperature range for the second stage of thermal degradation was 739～945 K，weight-loss rate was 6.3%，average activation energy was 176.1 kJ·mol^-1；in oxygen atmosphere，the temperature range for the first stage of thermal degradation was 459～719 K，weight-loss rate was 76.8%，the temperature range for the second stage of thermal degradation was 719～776 K，weight-loss rate was 23.2%，the temperature at the maximum thermal degradation rate was 735.0 K，and average activation energy was 51.76 kJ·mol^-1