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Temperature-dependent pyrolytic product evolution profile for polypropylene

机译:聚丙烯的温度相关热解产物演化曲线

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摘要

The composition of the pyrolysis products of plastics depends on disintegration of the macromolecule into variety of hydrocarbon fractions. In this work, a detailed gas chromatographic study of pyrolysis products of polypropylene (PP) between 200 and 600°C was carried out. The pyrograms have been analyzed in terms of amount of different products evolved at various pyrolysis temperatures. At low pyrolysis temperatures (200-300°C), the yield of lighter hydrocarbons (C5-C10) is low; it gradually increases until maximum decomposition temperature (446°C) and decreases thereafter. The following reaction types were considered to explain the decomposition mechanism of PP: (a) main chain cleavage to form chain-terminus radicals; (b) intramolecular hydrogen transfer to generate internal radicals; (c) intermolecular hydrogen transfer to form both volatile products and radicals; and (d) β-scission to form both volatiles and terminally unsaturated polymer chains.
机译:塑料热解产物的组成取决于大分子分解成各种烃馏分的能力。在这项工作中,对200至600℃之间的聚丙烯(PP)的热解产物进行了详细的气相色谱研究。已经根据在各种热解温度下析出的不同产物的量分析了热解图。在低热解温度(200-300°C)下,较轻烃(C5-C10)的收率较低;逐渐升高直至最高分解温度(446°C),此后降低。认为以下反应类型可以解释PP的分解机理:(a)主链断裂形成链末端自由基; (b)分子内氢转移产生内部自由基; (c)分子间氢转移形成挥发性产物和自由基; (d)β-断裂形成挥发物和末端不饱和聚合物链。

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