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在空气和氮气气氛下对聚氨酯硬泡(Rigid Polyurethane Foam,RPUF)进行了热重分析。在空气气氛下将样品分别以10℃/min、20℃/min、40℃/min和50℃/min的升温速率从室温加热至800℃。用Flynn-Wal-l Ozawa(FWO)等转化率方法和非线性多参数回归方法(Mu-ltivariate Non-linear Regression Method)计算热动力学参数。RPUF在空气和氮气气氛中的热解可认为是2步连续反应。RPUF在空气气氛中的热解过程可由Fn→Fn机理准确描述,在氮气气氛中则可由Fn→D3机理描述。基于可靠的动力学参数和反应机理函数,对RPUF在不同温度下的寿命进行了预测。结果表明,RPUF的寿命对温度变化非常敏感,同时受分解气氛等因素的影响。
Thermogravimetric analysis was performed on Rigid Polyurethane Foam (RPUF) under air and nitrogen atmosphere. The samples were heated from room temperature to 800 ° C at a heating rate of 10 ° C / min, 20 ° C / min, 40 ° C / min and 50 ° C / min, respectively, under an air atmosphere. Thermokinetic parameters were calculated using conversion methods such as Flynn-Wal-l Ozawa (FWO) and the non-linear regression method (Mu-ltivariate Non-linear Regression Method). The pyrolysis of RPUF in air and nitrogen atmosphere can be considered as a 2-step continuous reaction. The pyrolysis process of RPUF in air atmosphere can be accurately described by Fn → Fn mechanism, and can be described by Fn → D3 mechanism in nitrogen atmosphere. Based on the reliable kinetic parameters and reaction mechanism functions, the life expectancy of RPUF at different temperatures was predicted. The results show that the lifespan of RPUF is very sensitive to temperature changes and is influenced by factors such as decomposition atmosphere.