STUDY OF THERMAL DECOMPOSITION OF THE COPOLYMER BASED ON POLYETHYLENE GLYCOL FUMARATE WITH METHACRYLIC ACID

S. Davrenbekov, U.B. Toleuov, A. N. Bolatbai, D. Havlícek, T. Khamitova, E.J. Zhakupbekova
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Abstract

Thermal performance of copolymer based on polyethylene glycol fumarate and methacrylic acid in a dynamic mode, in an inert nitrogen environment are considered in the present work. Kinetic evaluation of thermal decomposition process was conducted using three different data processing methods (Friedman, Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose). Utilizing a mixed-method approach kinetic triplets Eа, A, g(a) were received. The received kinetic parameters were used to calculate the thermodynamic characteristics of Gibbs energy (∆G), enthalpy (∆H) and entropy of activation (∆S). Copolymer thermal gravimetric analysis (TGA) and differential thermogravimetric analysis (DTA) curves were studied under nitrogen environment using a heating rate of 2,5, 5, 10 or 20°C/min. The method of Invariant Kinetic Parameters was used to identify the reaction model and pre-exponential factor. The main phase of copolymer decomposition was set, which occurred within a narrow temperature interval and is evidenced by the spike on the differential curve. Values for 13 reaction models were received. Utilised methods resulted in a proper energy activation alignment within 223-229 kJ mol-1. Design and experimental data provided close values. TGA and DTA curve analysis has shown a sufficient thermal stability of these copolymers under the nitrogen environment.
富马酸聚乙二醇与甲基丙烯酸共聚物的热分解研究
本文研究了富马酸聚乙二醇与甲基丙烯酸共聚物在惰性氮环境下动态模式下的热性能。采用三种不同的数据处理方法(Friedman, Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose)对热分解过程进行动力学评价。采用混合方法得到了动力学三联体e, a, g(a)。利用接收到的动力学参数计算吉布斯能(∆G)、焓(∆H)和活化熵(∆S)的热力学特性。在2、5、5、10、20℃/min的加热速率下,研究了氮气环境下共聚物热重分析(TGA)和差热重分析(DTA)曲线。采用不变动力学参数法确定了反应模型和指前因子。确定了共聚物分解的主相,该主相发生在较窄的温度区间内,并在微分曲线上出现了峰值。得到13个反应模型的值。所使用的方法在223-229 kJ mol-1范围内得到了合适的能量激活对齐。设计和实验数据提供了接近的值。TGA和DTA曲线分析表明,这些共聚物在氮气环境下具有足够的热稳定性。
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