热致液晶聚酰胺的热分解动力学及寿命  

Thermal Stability and Degradation Kinetics of a Thermotropic Liquid Crystalline Polyamide

作　　者：袁慧萍[1] 张腾[1] 索红莉[1] 王朝[1] 程艳玲[1] 

机构地区：[1]北京工业大学材料科学与工程学院功能材料重点实验室,北京100124

出　　处：《高分子材料科学与工程》2011年第4期32-36,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(50771003);国家教委全国百篇优秀博士论文专项资金项目(200331);2008-博士后科技支持经费项目(Q5009001200801)

摘　　要：利用热重分析法,在不同升温速率下,对热致液晶聚酰胺热分解动力学进行研究。采用Friedman、Kissinger、Ozawa以及Coats-Redfern等方法对其动力学数据进行分析说明,确定其在氮气中反应机理函数是Avrami-Erofeev法则,活化能E≈208 kJ/mol;其在空气中初始热分解反应机理函数为Mempel Power法则,活化能E≈172 kJ/mol,后期热分解反应机理函数为反Jander法则,活化能E≈111 kJ/mol。并以失重5%作为寿终指标,计算热致液晶聚酰胺在不同温度的寿命,结果表明,其在尼龙加工温度范围内不会失效,适于与尼龙进行复合加工。Thermogravimetric analysis was used to study the thermal decomposition kinetics of the thermotropic liquid crystalline polyamide at different heating rates in streams of N2 and air.The mechanism function was identified with the kinetic parameters obtained from the analysis of TG-DTG curves by the Friedman method,the Kissinger method,the Ozawa method and the Coats-Redfern method.The most probable kinetic function of the thermal decomposition in N2 was Avrami-Erofeev theorem.The activation energy is 208 kJ/mol.The most probable kinetic function of the thermal decomposition in air of the first stages was Mempel Power theorem.The activation energy is 172 kJ/mol.The most probable kinetic function of the thermal decomposition in air of the sencond stages was reverse Jander theorem.The activation energy is 111 kJ/mol.The lifetime at weight-loss of 5% at different temperature was deduced by isothermal TG analysis.

关 键 词：热致液晶聚酰胺 热分解 动力学 寿命 

分 类 号：O631.1[理学—高分子化学]