摘要
本文以程序升温分解法为主要手段,讨论了PEEK的热分解动力学特征,计算了热分解动力学参数;并辅以红外光谱法,探讨了PEEK样品的热分解交联机理.结果发现:PEEK的热分解并不是简单过程,而是分三个阶段进行;相应阶段的活化能分别为296.0kJ/mol,123.7kJ/mol,153.4kJ/mol,反应级数均为一级;第一阶段与第二阶段具有连串反应的动力学特征,而第二阶段与第三阶段具有平行反应的动力学特征.PEEK的热分解由芳醚键的断裂开始,形成自由基,尔后同时发生分解和交联过程,形成小分子化合物及交联结构.
The kinetic characteristics of thermal degradation of PEEK was studied by temperature programmed decomposition. The results show that the thermal degradation of PEEK is not a simple process, but proceeds by three stages. The activation energies are 296.0kJ/mol, 123.7kJ/mol, 153. 4kJ/mol respectively and the reaction order are 1 for all three stages. The mechanism of thermal degradation and cross linking of PEEK is also discussed. It is concluded that the thermal degradation of PEEK is started from the breakdown of Ar - O bands and the successive degradation is accompanied by thermal crosslinking.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1997年第12期1152-1157,共6页
Acta Chimica Sinica
基金
化工部科技基金资助项目
