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首页> 外文期刊>Journal of Applied Polymer Science >Impact of Oxygen Transport Properties on the Kinetic Modeling of Polypropylene Thermal Oxidation. II. Effect of Oxygen Diffusivity
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Impact of Oxygen Transport Properties on the Kinetic Modeling of Polypropylene Thermal Oxidation. II. Effect of Oxygen Diffusivity

机译：输氧性能对聚丙烯热氧化动力学模型的影响。二。氧气扩散率的影响

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The kinetic model, established in a previous article (Francois-Heude et al., J. Appl. Polym. Sci., in press) to predict the homogeneous oxidation in iPP films typically thinner than 100 mm, is now extended to simulate the oxidation profiles in thicker plates by coupling the oxygen diffusion and its consumption by the chemical reactions. In this perspective, oxygen transport properties (namely oxygen solubility, diffusivity, and permeability) are measured by permeametry on a reference iPP. These values are compared with an exhaustive compilation of literature data to evaluate their variability among the whole iPP family, which one has been reasonably ascribed to initial differences in polymer morphology, but also to evaluate their consistency, especially their temperature dependence between 20 and 140 degrees C. Failing to simulate oxidation profiles, the kinetic model is then used as an inverse resolution method for estimating more satisfactory values of oxygen transport properties. It is thus evidenced that the crystallinity changes induced by thermal oxidation largely explains the dramatic decrease in oxygen penetration toward the sample core just after the induction period. A strategy aimed for introducing the relationship between the polymer crystalline morphology and oxygen transport properties into the kinetic model is given in the graphical abstract, although the effect of polymer polarity remains to be established prior to this implementation. (C) 2014 Wiley Periodicals, Inc.
机译：在先前的文章（Francois-Heude等人，J。Appl。Polym。Sci。，印刷中）中建立的动力学模型可用来预测通常小于100 mm的iPP薄膜中的均匀氧化，现在将其扩展为模拟氧化通过耦合氧扩散及其通过化学反应的消耗，可以在较厚的板中形成轮廓。从这个角度来看，氧气渗透性（即氧气溶解度，扩散性和渗透性）是通过在参考iPP上进行的渗透法测量的。将这些值与详尽的文献数据进行比较，以评估它们在整个iPP系列中的变异性，该变异性被合理地归因于聚合物形态的初始差异，还评估了它们的一致性，尤其是它们在20至140度之间的温度依赖性C.无法模拟氧化曲线，然后将动力学模型用作反解析方法，以估算更令人满意的氧气传输性能值。因此，有证据表明，由热氧化引起的结晶度变化很大程度上解释了在诱导期之后，氧气向样品芯的渗透性急剧下降。图形摘要中给出了一种旨在将聚合物晶体形态与氧传输性质之间的关系引入动力学模型的策略，尽管在此实现之前仍需要建立聚合物极性的影响。 （C）2014威利期刊公司

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