聚丙烯酸钠的热分解动力学

Thermal Decomposition Kinetics of Sodium Polyacrylate

采用TG/DTA联用技术,在10、15、202、5 K.min-1不同线性升温条件下,研究了聚丙烯酸钠的热分解过程.结果表明,在空气气氛下,聚丙烯酸钠的热分解主要分为两个阶段.应用非等温多重扫描速率法对热分解过程的第一阶段进行了动力学分析,并计算得到了聚丙烯酸钠热分解的动力学3因子,分别是热分解活化能E=132.88 KJ.mol-1,指前因子lg(A)=9.103,以及相边界反应型的机理函数,其积分形式G(α)=1-(1-α)12和微分形式f(α)=2(1-α)12.

The thermal decomposition processes of sodium polyacrylate are studied using TG/DTA at various heating rates of 10,15,20,25 K · min^-1. The results show that the decomposition proceeds through two steps in air atmosphere. The thermal decomposition kinetics of the first step is investigated employing non-isothermal multiple scanning method, the thermal analysis kinetic triplet of sodium polyacrylate is determined, the apparent activation energy is E= 132.88 kJ · mol^-1 , pre-exponential factor lg（A）= 9. 103, and the most probable mechanism belongs to interactions at phase boundaries, with integral form G（α）=1-（1-α）1/2 and differential form f（α）=2（1-α）1/2.