
热重分析法研究硅橡胶复合绝缘子热解动力学
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
Study of Pyrolysis Kinetics of Silicone Rubber Composite Insulators by Thermogravimetric Analysis
通过热重分析(TGA)研究硅橡胶绝缘子(SiR)在氮气(N2)和空气环境中的热解动力学。将3种不同的等转化模型Flynn-Wall-Ozawa(FWO)、Kissinger-Akahira-Sunose(KAS)和Friedman(FR)方法应用于TGA结果分析,以计算活化能和指数前因子。在N2气氛下采用FWO、KAS和FR方法计算的平均活化能分别为421.46、431.60、433.98 kJ/mol,指数前因子范围为109~1016,热解与表面积无关。在空气气氛下采用FWO、KAS和FR方法计算的平均活化能分别为127.21、120.93、123.38 kJ/mol,指前因子范围为108~109,热解受表面积控制。在N2气氛下,反应的热力学性质,如焓变(ΔH)、吉布斯自由能(ΔG)和熵变(ΔS)远高于空气气氛,证实了N2气氛下反应的复杂性。研究结果有助于加深对SiR燃烧机理的理解,并为其作为一种更有效的耐高温材料的可行性研究提供参考。
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.
SiR / TGA / Pyrolysis kinetics / Activation energy
TQ33 / TM216
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