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Impact of Oxygen Transport Properties on Polypropylene Thermal Oxidation, Part 1: Effect of Oxygen Solubility

机译:输氧性能对聚丙烯热氧化的影响,第1部分:氧溶解度的影响

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摘要

A general kinetic model is proposed to describe the polypropylene thermal oxidation of thin polypropylene films in a wide range of temperatures (from 60 to 200 degrees C) and oxygen partial pressures (from 0.02 to 5 MPa) using a single set of parameters. This model was calibrated with several series of experimental data including analyses of primary (hydroperoxides) and secondary oxidation products (carbonyl species), and subsequent changes in macromolecular properties (average molecular masses). It predicts the experimental data previously published in the literature in terms of induction times and maximal oxidation rates. The variability of the oxygen solubility coefficient allows to explain the scattering of induction times and oxidation rates among the whole iPP family, but also the dependence of this latter quantity with oxygen partial pressure. This variability is presumably due to iPP polymorphism in the temperature range where oxygen permeability is commonly measured. It is concluded that the kinetic model can be used to study the direct effect of iPP morphology on its thermal oxidation kinetics (chemistry of oxidation). (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41441.
机译:提出了一个通用的动力学模型来描述使用单组参数在很宽的温度范围(60至200摄氏度)和氧分压(0.02至5 MPa)下聚丙烯薄膜的聚丙烯热氧化。该模型已通过一系列实验数据进行了校准,包括对一级(氢过氧化物)和二级氧化产物(羰基物质)的分析,以及随后大分子性质(平均分子量)的变化。它根据诱导时间和最大氧化速率预测了先前在文献中发表的实验数据。氧溶解度系数的可变性可以解释整个iPP系列中诱导时间和氧化速率的分散,但也可以解释后者的数量与氧分压的关系。这种变化可能是由于在通常测量透氧性的温度范围内的iPP多态性引起的。结论是,动力学模型可用于研究iPP形态对其热氧化动力学(氧化化学)的直接影响。 (c)2014 Wiley Periodicals,Inc. J. Appl。 Polym。科学2015,132,41441。

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