塑料科技2024，Vol.52Issue(11)：30-36,7.DOI:10.15925/j.cnki.issn1005-3360.2024.11.006
热重分析法研究硅橡胶复合绝缘子热解动力学
Study of Pyrolysis Kinetics of Silicone Rubber Composite Insulators by Thermogravimetric Analysis
摘要
Abstract
The pyrolysis kinetics of silicone rubber insulators(SiR)in nitrogen(N2)and air environments were studied by thermogravimetric analysis(TGA).Three transformation models,Flynn-Wall-Ozawa(FWO),Kissinger-Akahira-Sunose(KAS),and Friedman(FR)methods,were applied to calculate activation energy and pre-exponential factors.The average activation energies of FWO,KAS,and FR methods under N2 atmosphereare were 421.46,431.60,433.98 kJ/mol,respectively.The pre-exponential factor ranged from 109 to 1016,which illustrated that the pyrolysis was independent of surface area.Under the air atmosphere,the average activation energies of FWO,KAS,and FR methods were 127.21,120.93,123.38 kJ/mol,respectively.The value of pre-exponential factor ranged from 108 to 109,and pyrolysis was controlled by surface area.The thermodynamic properties of the reaction under N2 atmosphere,such as enthalpy changes(ΔH),Gibbs free energy(ΔG)and entropy change(ΔS)were much higher than that under air atmosphere,confirming the complexity of the reaction in N2.The results of the study contribute to a deeper understanding of the combustion mechanism of SiR and provide a reference for its feasibility as a more effective high-temperature resistant material.关键词
硅橡胶绝缘子/热重分析/热解动力学/活化能Key words
SiR/TGA/Pyrolysis kinetics/Activation energy分类
化学化工引用本文复制引用
李子由,雷鸣东,李强,干强,赵银山,陈健哲..热重分析法研究硅橡胶复合绝缘子热解动力学[J].塑料科技,2024,52(11):30-36,7.基金项目
中国南方电网重点科技资助项目(110002022030301SJ0001) （110002022030301SJ0001）
