摘要
在氮气氛中采用热重分析的方法对聚萘二甲酸乙二酯(PEN)的热降解动力学进行了研究。采用Friedman和Chang两种单一加热速率方法对活化能Ea、反应级数n和频率因子Z等降解反应动力学参数进行了分析。讨论了降解机理以及加热速率和计算方法对降解温度和降解动力学参数的影响。由单一加热速率法得到的Td、Tdm和(dα/dt)m,以及Ea和ln(Z)值均随加热速率的增加而增加,n值则随加热速率略有变化。随加热速率的提高,聚合物的降解由分解控制转变为扩散控制过程。
The thermal degradation kinetics of poly （ethylene 2,6-naphthalate）（PEN） in nitrogen was studied by dynamic thermogravimetry （TG）. The kinetic parameters, including the activation energy Ea, the reaction order n, and the frequency factor ln（Z） of the degradation reaction for PEN were analyzed by the single heating rate methods of Friedman and Chang. The effects of the heating rate and the calculating method on the degradation mechanics and degradation kinetic parameters were systematically discussed. The value of Ea and In （Z） increases with the increasing of heating rate. With the increasing of heating rate, the degractation of polymer is changed from decomposition control to diffusion control.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2009年第2期109-111,115,共4页
Polymer Materials Science & Engineering
关键词
聚萘二甲酸乙二酯
热降解
热重分析
动力学
热稳定性
poly （ethylene 2,6-naphthalate）
thermal degradation
thermogravimetry
kinetics
thermostability
