The experimental study of the kinetics and modes of the thermal degradation of polymethyl methacrylate (PMMA) in an argon flow was carried out. During thermogravimetric analysis the sample heating rates were 2, 5, 8, 20 and 35 K/min. Based on the integral isoconversional method the values of the kinetic rate constants of the PMMA thermal degradation were determined. When modeling the decomposition process of PMMA for low conversion degrees, it is advisable to use the reaction rate constant obtained for the conversion degree equal to 20 %, and for modeling the whole process – 50 %. Therefore, for evaluation calculations, it is possible to describe the process of PMMA decomposition with one gross reaction. Also, the investigation of the thermal degradation of PMMA particles under conductive heating conditions (680, 700, 720 K) in an argon and air was carried out. Based on the analysis of the data obtained, a scheme for the decomposition of PMMA, consisting of four stages, was established.

中文翻译：

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聚甲基丙烯酸甲酯在氩气流中热降解动力学和模式的实验研究


对聚甲基丙烯酸甲酯（PMMA）在氩气流中热降解的动力学和模式进行了实验研究。在热重分析过程中，样品加热速率为 2、5、8、20 和 35 K/min。基于积分等转化法，测定了PMMA热降解的动力学速率常数值。当对低转化率的 PMMA 分解过程进行建模时，建议使用转化率等于 20% 时获得的反应速率常数，而对整个过程进行建模时，建议使用 – 50% 时获得的反应速率常数。因此，在评价计算中，可以用一个总反应来描述PMMA的分解过程。此外，还对 PMMA 颗粒在氩气和空气中传导加热条件（680、700、720 K）下的热降解进行了研究。基于对获得的数据的分析，建立了由四个阶段组成的 PMMA 分解方案。