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材料热稳定性测定的方法很多,一般粗略的测定是把TG(热重)曲线开始失重的温度或DTA曲线的热分解峰的峰顶温度当作“热分解温度”但这种方法太粗略。本文对一种化纤用有机助剂进行了热分析动力学研究,首先用Kissinger法计算了热分解反应级数n=0.94,活化能E_k=36.7千卡/克分子。再用Ozawa中点法计算了该助剂热分解反应的活化能E_中=34.4千卡/克分子。最后用恒温TG测定了这种助剂失重10%的寿命,推导了寿命公式为1gr=7.624×10~3·1╱T-13.172。用此方法计算的活化能E_寿=34.89千卡/克分子。利用寿命方程计算了不同温度条件下该助剂重量损失10%的寿命。
There are many ways to determine the thermal stability of a material. The general rough measure is the temperature at which the TG curve begins to lose weight or the peak temperature of the thermal decomposition peak of the DTA curve as the “thermal decomposition temperature” but this method is too coarse. In this paper, a thermal analysis kinetics study of organic chemical auxiliaries was carried out. First, the thermal decomposition reaction order n = 0.94 and the activation energy E_k = 36.7 kcal / mol were calculated by Kissinger method. Then using Ozawa midpoint method to calculate the activation energy of the thermal decomposition reaction E_ = 34.4 kcal / mole. Finally, the thermostatic TG was used to measure the lifetime of 10% weight loss of this additive, and the life formula was deduced as 1gr = 7.624 × 10 ~ 3 · 1 / T-13.172. The activation energy calculated by this method E_ life = 34.89 kcal / mole. The lifetime of 10% of the weight loss of the additive under different temperature conditions was calculated by using the life equation.