Kinetics and mechanism of thermal and thermo-oxidative degradation for high-density polyethylene modified by fullerene and its derivative

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-09-24 DOI:10.1016/j.tca.2024.179871

Bingtao Wang , Yanqun Pan , Liping Zhao , Juan Li , Zhenghong Guo

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Abstract

To investigate the effect of fullerene (C₆₀) and its iron compound (C₆₀-Fe) on the thermal and thermo-oxidative degradation mechanism of high-density polyethylene (HDPE), the Kissinger method, Flynn-Wall-Ozawa method and Coats-Redfern methods are used. The data of thermal and thermo-oxidative degradation are achieved through the thermogravimetric (TG) analysis, and the trapping free-radical ability and the dispersion of C₆₀ or C₆₀-Fe in matrix are characterized by the electron spin resonance (ESR) and transmission electron microscopy (TEM). C₆₀ and C₆₀-Fe improve effectively the thermal and thermo-oxidative stability of HDPE. In N₂, C₆₀ and C₆₀-Fe do not change the degradation mechanism of HDPE, and the degradation rate is determined by the random generation and growth of free-radicals. In air, C₆₀ changes the reaction order (n) of HDPE at the oxidation stage and the degradation mechanism at the random fracture. C₆₀-Fe changes the thermo-oxidative mechanism of HDPE due to the formation of cross-linked network.

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富勒烯及其衍生物改性高密度聚乙烯的热降解和热氧化降解动力学与机理

为了研究富勒烯（C60）及其铁化合物（C60-Fe）对高密度聚乙烯（HDPE）热降解和热氧化降解机理的影响，采用了基辛格法、Flynn-Wall-Ozawa 法和 Coats-Redfern 法。热重（TG）分析获得了热降解和热氧化降解的数据，电子自旋共振（ESR）和透射电子显微镜（TEM）表征了 C60 或 C60-Fe 在基体中捕获自由基的能力和分散性。C60 和 C60-Fe 能有效提高高密度聚乙烯的热稳定性和热氧化稳定性。在氮气中，C60 和 C60-Fe 不会改变高密度聚乙烯的降解机理，降解速率由自由基的随机生成和增长决定。在空气中，C60 改变了高密度聚乙烯氧化阶段的反应顺序（n）和随机断裂的降解机理。由于形成了交联网络，C60-Fe 改变了高密度聚乙烯的热氧化机理。

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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