Abstract Pyrolysis behaviors of poly(ethylene-co-vinyl acetate) (EVA) depending on pyrolysis temperature were investigated. EVA was pre-pyrolyzed at 400 °C to remove acetic acid before main pyrolysis. The deacetylated EVA was pyrolyzed at 550–800 °C and variations of the major pyrolysis products with the pyrolysis temperature were examined. The major pyrolysis products were alkanes, alkenes, alkadienes, and cyclic compounds including aromatic species. Most of the major pyrolysis products increased as the pyrolysis temperature increased except for the alkanes. Relative abundances of the alkadienes and aromatic compounds were notably increased by increasing the pyrolysis temperature. By increasing the pyrolysis temperature, relative intensity ratios of butadiene/1-butene and styrene/1-butene linearly increased whereas those of cycloheptadiene (or vinylcyclopentene)/1-butene and vinylcyclohexene/1-butene linearly decreased. From Arrhenius plots for the principal pyrolysis products, relative activation energies for the formations of butadiene, cycloheptadiene (or vinylcyclopentene), vinylcyclohexene, and styrene were obtained. Pyrolysis behaviors of the deacetylated EVA were explained by formation mechanisms including ethylene-vinyl acetate heterosequence and dehydrogenation reactions.

中文翻译：

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脱乙酰聚（乙烯-共-醋酸乙烯酯）的热解行为取决于热解温度

摘要 研究了聚(乙烯-共-醋酸乙烯酯) (EVA) 的热解行为随热解温度的变化。在主热解之前，EVA 在 400 °C 下预热解以去除乙酸。脱乙酰 EVA 在 550-800 °C 下热解，主要热解产物随热解温度的变化而变化。主要的热解产物是烷烃、烯烃、链二烯和包括芳香族物质在内的环状化合物。除烷烃外，大多数主要热解产物随着热解温度的升高而增加。通过提高热解温度，链二烯和芳香族化合物的相对丰度显着增加。通过提高热解温度，丁二烯/1-丁烯和苯乙烯/1-丁烯的相对强度比线性增加，而环庚二烯（或乙烯基环戊烯）/1-丁烯和乙烯基环己烯/1-丁烯的相对强度比线性下降。从主要热解产物的 Arrhenius 图中，获得了形成丁二烯、环庚二烯（或乙烯基环戊烯）、乙烯基环己烯和苯乙烯的相对活化能。脱乙酰EVA的热解行为可以通过乙烯-醋酸乙烯异序和脱氢反应等形成机制来解释。