中国电机工程学报2024，Vol.44Issue(9)：3399-3407,中插5,10.DOI:10.13334/j.0258-8013.pcsee.232599
聚苯醚绝缘材料热氧老化动力学参数计算方法
Calculation Method of Thermo-oxidative Aging Kinetic Parameters of Polyphenylene Oxide Insulating Materials
摘要
Abstract
Polyphenylene oxide(PPO)is an important material in industries such as new energy storage and 5G communication.The calculation of thermogravimetric kinetic parameters is the key to quickly evaluate the thermal life of PPO.However,the thermogravimetric analysis usually selects nitrogen atmosphere and high heating rates,which could cause the aging mechanism to change.Therefore,the actual aging process of PPO is simulated by thermogravimetric experiment under slow heating rates and air atmosphere.The Doyle coefficient is modified by fitting the numerical solutions of temperature integral in the interval of failure temperatures corresponding to multiple heating rates.Kinetic analysis is carried out in the early thermo-oxidative degradation stage to get the activation energy of PPO,and the reaction mechanism function during this stage is estimated to calculate the pre-exponential factor.The results show that the accuracy of this method is higher than that of Flynn-Wall-Ozawa method and ASTM E1641-18 method in solving the activation energy,and the actual thermo-oxidative aging of PPO can be equivalent to a single reaction following the quasi-power law reaction mechanism function,according to which,the calculation of the pre-exponential factor is more reliable than the standard method where the model of a chemical first-order reaction is preset.The above work provides an effective technical method for the calculation of thermo-oxidative aging kinetic parameters of polymer insulation.关键词
聚苯醚/慢速升温/热重分析/热氧老化/动力学参数Key words
polyphenylene oxide/slow heating/thermogravimetric analysis/thermo-oxidative aging/kinetic parameters分类
信息技术与安全科学引用本文复制引用
刘飞,黄兴溢,江平开..聚苯醚绝缘材料热氧老化动力学参数计算方法[J].中国电机工程学报,2024,44(9):3399-3407,中插5,10.基金项目
国家自然科学基金项目(51877132,52373012). Project Supported by National Natural Science Foundation of China(51877132,52373012). （51877132,52373012）
