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采用热重-差示扫描量热(TG-DSC)联用技术,对空气和氮气氛围模塑聚苯乙烯(EPS)材料的热解动力学行为特性进行了实验研究,深入分析了气氛条件对EPS的热解动力学参数及反应机理函数的影响。结果发现:与空气气氛相比,氮气气氛下的热解曲线向高温区移动,反应起始和终止温度和峰温均相应提高,说明有氧存在热解反应更易进行;进一步利用Coats-Redfern法分析发现两种气氛条件下EPS的热解行为服从不同的反应机理函数,空气气氛时为成核与核增长函数A2/3,氮气气氛时为反应级数函数F3。
The thermodynamic and thermodynamic properties of air and nitrogen atmosphere molded polystyrene (EPS) materials were investigated by using TG-DSC technique. The effects of atmosphere conditions Influence of pyrolysis kinetic parameters and reaction mechanism function of EPS. The results showed that compared with the air atmosphere, the pyrolysis curve under nitrogen atmosphere moved to the high temperature region, and the reaction initiation and termination temperatures and peak temperatures increased correspondingly, which indicated that the pyrolysis reaction was more easily carried out under aerobic conditions. The Coats-Redfern method It was found that the pyrolysis behavior of EPS obeyed different reaction mechanism functions under both atmosphere conditions, the nucleation and nucleation growth function A2 / 3 in air atmosphere and the reaction progression function F3 in nitrogen atmosphere.