不同热辐射强度下聚碳酸酯的燃烧性能研究

Research on the Combustion Performance of Polycarbonate Under Different Heat Radiation Intensity

采用锥形量热仪和热重分析仪研究了聚碳酸酯(PC)的燃烧性能和热稳定性。结果表明:PC的热解过程分为两个阶段,随着热辐射强度的增加(从40 kW/m^2增加到50 kW/m^2),PC的点燃时间和燃烧时间都有所增加;热释放速率峰值升高,且峰值出现时间提前;产烟率峰值升高,且峰值出现的时间也明显提前;质量损失率增加,分解温度提前。此外,通过火灾性能指数(FPI)和火灾增长指数(FGI)评估了PC的火灾危险性,随着热辐射强度的增加,FPI降低,FGI增加。

In this paper,the combustion performance and thermal stability of polycarbonate were investigated by using cone calorimeter and thermogravimetric analyzer.The results show that the pyrolysis process of polycarbonate is divided into two stages.With the increase in thermal radiation intensity(increase from 40 kW/m^2 to 50 kW/m^2),the ignition time and burning time of polycarbonate increase;the peak heat release rate increases,and the peak appears earlier.The peak of the smoke production rate increases,and the time of the peak appears earlier;the mass loss rate increases,and the decomposition temperature advances.In addition,the fire risk of polycarbonate was evaluated through the fire performance index(FPI)and the fire growth index(FGI).FPI decreases with the increasing of thermal radiation intensity while FGI increases.