摘要
利用热重分析(TG、DTG)研究了主链含苯基均三嗪联苯型聚芳醚在不同气氛和升温速率时的热降解动力学。比较了升温速率和气体气氛对热降解行为的影响,结果表明,该聚合物具有优异的耐热性和耐热氧化稳定性。用Flynn-Wall-Ozawa,Freeman-carroll等方法进行了动力学处理,计算得热降解反应活化能分别为291.19kJ/mol,286.83kJ/mol,与Kissinger法计算活化能值283.25kJ/mol非常接近。结合Coats-Redfern方法,推测出聚合物在氮气气氛中的热分解机理为F2机理,其机理函数积分式为g(α)=1/(1-α)。
The thermal degradation of bipheny-based phenyl-s-triazine-containing poly（arylene ether）s （PE-TR） was investigated by the thermogravimetric analysis （TGA） and derivative thermogravimetric analysis （DTG） under N2 or air flow in dynamic heating conditions. The influence of the heating rate and the nature of atmosphere on the thermal decomposition temperatures of PE-TR was studied. Thermal results from TGA and DTG indicate that PE-TR possesses excellent thermal and oxidative stability. The apparent activation energy （Ea） calculated by using Flynn-Wall-Ozawa and Friedman methods （291.19 kJ/mol,286.83 kJ/mol）,are in good agreement with that by using the Kissinger method （283.25 kJ/mol）. The solid-state decomposition process is found to be a mechanism involving random nucleation with two nucleus on the individual particle （F2 mechanism） in terms of the Coats Redfern method.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2010年第4期75-77,81,共4页
Polymer Materials Science & Engineering
关键词
亲核取代
聚芳醚
苯基均三嗪
热分解动力学
nucleophilic substitution
poly（arylene ether）s
phenyl-s-triazine
thermodynamics
