Abstract Whereas increasing plastic solid waste production constitutes one of the main challenges of modern society, mainly due to the lack of suitable recycling technologies, chemical recycling represents an attractive solution for the conversion of plastic solid waste into valuable chemical intermediates. Herein, a kinetic model for the pyrolysis of a dental industry waste, ethylene glycol dimethacrylate (EGDMA) crosslinked poly (methyl methacrylate) (PMMA), is presented for the first time. Kinetics parameters and their statistical significance have been estimated from eight non-isothermal thermogravimetric analysis (TGA) experiments with heating rates varying between 5 and 50 °C·min−1 by using nonlinear regression. Our analysis indicates that the mechanism of depolymerisation of EGDMA crosslinked PMMA is likely to involve a consecutive reaction pathway involving two steps. The developed kinetic model - containing five kinetic parameters only - was able to predict well all non-isothermal TGA runs, and was validated against isothermal TGA experiments at 400 °C.

中文翻译：

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模拟交联聚（甲基丙烯酸甲酯）的化学循环：解聚动力学

摘要 增加塑料固体废物产量是现代社会的主要挑战之一，主要是由于缺乏合适的回收技术，化学回收是将塑料固体废物转化为有价值的化学中间体的有吸引力的解决方案。在此，首次提出了牙科工业废物、乙二醇二甲基丙烯酸酯 (EGDMA) 交联聚甲基丙烯酸甲酯 (PMMA) 热解的动力学模型。动力学参数及其统计显着性已通过使用非线性回归从八次非等温热重分析 (TGA) 实验中估计出来，加热速率在 5 到 50 °C·min-1 之间变化。我们的分析表明，EGDMA 交联 PMMA 的解聚机制可能涉及包含两个步骤的连续反应途径。开发的动力学模型 - 仅包含五个动力学参数 - 能够很好地预测所有非等温 TGA 运行，并针对 400 °C 下的等温 TGA 实验进行了验证。