【摘要】 用热重分析(TG)和微分热重分析(DTG)研究了SIS-g-AA的热降解动力学。结果表明,该共聚物在N2气氛中的热降解分2步完成:第1步的热降解温度为553～703K;第2步的热降解温度为703～873K。用Achar方程和Coats-Redfern方程对常见的机理函数进行计算比较,得到第1步热降解平均活化能Ea=177.43kJ/mol,热降解的积分机理函数g(α)=(1-α)-1-1,频率因子lnA=27.48;热降解的微分机理函数f(α)=(1-α)2,频率因子lnA=34.05。在O2气氛中的降解分5步完成:第1步的热降解温度为448～543K,第2步的热降解温度为543～577K,第3步的热降解温度为577～640K,第4步的热降解温度为640～696K,第5步热降解温度为696～767K。用Achar方程和Coats-Redfern方程对40种常见的机理函数进行计算比较,得到第2步热降解平均活化能Ea=206.82kJ/mol,热降解的积分机理函数g(a)=[(1-α)-1/3-1]2,频率因子lnA=35.16;热降解的微分机理函数f(α)=3(1-α)4/3[(1-α)-1/3-1]-1/2,频率因子lnA=41.79。更多还原

【Abstract】 Under oxygen and nitrogen atmosphere condition,SIS-g-AA thermal degradation process has been studied using thermal analysis method. The results indicated the SIS-g-AA degradation included two steps under nitrogen atmosphere condition,the first step of thermal degradation temperature approximately is 553~703K,the second step of thermal degradation temperature approximately is 703～873K;The SIS-g-AA degradation included five steps Under oxygen atmosphere condition,the first step of thermal degradation temperature approximately is 448~543K,the second is 543~577K,the third is 577~640K,the fourth is 640~696K,the fifth is 696~767K. Compared with the common mechanism function with Achar and Coats-redfern method,the average activation energy of the first step under nitrogen was 177.43kJ/mol,the integral function of the thermal degradation mechanism was g(a)= (1-α)-1-1,frequency factor lnA was27.48,the differential function of the thermal degradation mechanism was f(α)= (1-α)2 and frequency factor lnA was 34.05. The results also indicated that the average activation energy of the second step under oxygen was 206.82kJ/mol,the integral function of the thermal degradation mechanism was g(a)= [(1-α)-1/3-1]2,frequency factor lnA was 35.16,the differential function of the thermal degradation mechanism was f(α)=3(1-α)4/3[(1-α)-1/3-1]-1 /2,and frequency factor lnA was 41.79.更多还原