摘要
利用热重(TG)分析技术对聚氧丙烯醚的热失重行为进行了研究.采用非等温TG-DTG技术,在5.0、10.0、15.0和20.0 K/min线性升温速率和空气气氛条件下,考察了聚氧丙烯醚的非等温热分解机理及反应动力学.运用Freeman-Carroll、Kissinger、Ozawa、Coats-Redfern和Achar等方法对非等温动力学数据进行分析,确定了聚氧丙烯醚热分解反应的机理函数为Mampel Power法则(m=1),对应机理为幂函数法则,其表观活化能为62.5kJ/mol,指前因子为106.17s-1.同时采用等温TG技术得到失重10%和15%为寿终指标的寿命方程.
Thermogravimetric （TG） analysis was used to study the pyrolysis characteristics of polyoxypro pylene ether. The thermal decomposition kinetics of polyoxypropylene ether was investigated by means of non isothermal TG-DTG at different heating rates of 5.0, 10.0, 15.0, and 20.0 K/min in a stream of air. The mechanism function was identified with the kinetic parameters obtained from the analysis of TG-DTG curves by the Freeman-Carroll method. the Kissinger method, the Ozawa method, the Coats-Redfern method and the Achar method. The most probable kinetic function of the thermal decomposition is the exponential function with m= 1, and the corresponding machanism follows Mampel Power theorem. The apparent activation energy and the pre-exponential constant are 62.5 kJ/mol and 10^6.17 s^-1 respectively. The lifetime equation at weight-loss of 10; and 15% were deduced by isothermal TG analysis.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2006年第4期689-693,共5页
Journal of Zhejiang University：Engineering Science
基金
浙江省科技计划资助项目(2006C21073)
关键词
聚氧丙烯醚
热分解
非等温动力学
热寿命
polyoxypropylene ether
thermal decomposition
non-isothermal kinetics
lifetime
