The experimental study of the kinetics and modes of polymethyl methacrylate thermal degradation in argon flows

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-04-28 DOI:10.1016/j.tca.2024.179756

Eugene A. Salgansky , Marina V. Salganskaya , Dmitrii O. Glushkov , Andrey O. Pleshko

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Abstract

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.

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聚甲基丙烯酸甲酯在氩气流中的热降解动力学和模式的实验研究

实验研究了聚甲基丙烯酸甲酯（PMMA）在氩气流中的热降解动力学和模式。在热重分析过程中，样品的加热速率分别为 2、5、8、20 和 35 K/分钟。根据积分等转换法，确定了 PMMA 热降解的动力学速率常数的值。在为低转化率的 PMMA 分解过程建模时，建议使用转化率等于 20% 时获得的反应速率常数，而为整个过程建模时则使用转化率为 50%时获得的反应速率常数。因此，在进行评估计算时，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的传导加热条件（680、700、720 K）下的热降解进行了研究。根据对所获数据的分析，建立了由四个阶段组成的 PMMA 分解方案。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes