AC721聚酰亚胺树脂热氧老化特性及降解动力学  

Thermal oxidation aging characteristics and degradation kinetics of AC721 polyimide resin

作　　者：张朋 孙劲松 刘寒松 姚逸伦 钟翔屿 包建文 ZHANG Peng;SUN Jin-song;LIU Han-song;YAO Yi-lun;ZHONG Xiang-yu;BAO Jian-wen(AVIC Manufacturing Technology Institute,AVIC Composite Technology Center,National Key Laboratory of Advanced Composites Laboratory,Beijing 101300,China)

机构地区：[1]中国航空制造技术研究院,航空工业复合材料技术中心,先进复合材料重点实验室,北京101300

出　　处：《热固性树脂》2023年第3期38-43,共6页Thermosetting Resin

摘　　要：采用热失重分析(TGA)和等温热氧老化方法研究了苯乙炔基封端聚酰亚胺树脂AC721的热氧化稳定性,并利用Kissinger方法建立了AC721树脂在不同气氛下的热降解动力学。TGA结果表明聚酰亚胺树脂氮气气氛下的5%热分解温度(Td5%)比空气气氛下高19℃,并且残重更高,热降解速率更低。等温热氧化老化结果表明AC721的失重率-等温老化时间关系符合一阶指数增长函数,且树脂表面的降解程度明显大于内部。AC721树脂在氮气和空气中的降解活化能分别为257.07 kJ/mol和173.68 kJ/mol,从不同角度验证了氧气对聚酰亚胺树脂的热降解起到了加速和促进作用。The thermal oxidation stability of phenylethynyl terminated polyimide resin AC721 was studied by thermal weight loss analysis(TGA)and isothermal oxygen aging methods,and the thermal degradation kinetics of AC721 resin under different atmospheres was further established by Kissinger method.The TGA results showed that the 5%thermal decomposition temperature(Td5%)of polyimide resin under nitrogen atmosphere was 19℃higher than under air atmosphere,and exhibited higher residual weight and lower thermal degradation rate.The isothermal oxidative aging results showed that relationship between the weight loss rate and isothermal aging time of AC721 complied with the first-order exponential growth function,and the degradation degree of the resin surface was significantly greater than that of the interior.The degradation activation energy of AC721 resin under nitrogen and air was 257.07 kJ/mol and 173.68 kJ/mol,respectively,which verified that the oxygen accelerated and promoted the thermal degradation of polyimide resin from different aspects.

关 键 词：聚酰亚胺 热氧老化 热氧化稳定性 热降解 动力学 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]