Abstract In this work, the effect of iron stearate (IS) on the thermal degradation of polypropylene (PP)/poly (lactic acid) (PLA) blend compatibilized by polypropylene-grafted-maleic anhydride during artificial aging for 21 days at 70 °C, with sampling every 7 days has been investigated. The thermogravimetric (TG) analysis revealed a two-stage degradation process for the blends (with and without IS), which corresponded to each polymer in the blends. For each degradation stage, the decomposition temperature shifts to a lower value for the system that contains IS. Broadly, the kinetic modeling proved that the activation energy (Ea) decreases with the addition of IS and the artificial aging progress. Moreover, the decomposition mechanisms are dependent on the incorporation of IS and artificial aging. Besides, the lifetimes of the investigated samples were assessed at different failure temperatures using the obtained kinetic triplets. Both IS and artificial aging progress reduce significantly the lifetimes of the PP/PLA blends.

中文翻译：

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人工老化过程中添加硬脂酸铁的 PP/PLA 共混物的热分解动力学和寿命预测

摘要 在这项工作中，硬脂酸铁 (IS) 在 70 °C 下人工老化 21 天期间对聚丙烯 (PP)/聚乳酸 (PLA) 共混物与聚丙烯接枝马来酸酐相容的热降解的影响，每 7 天采样一次。热重 (TG) 分析揭示了共混物（有和没有 IS）的两阶段降解过程，这对应于共混物中的每种聚合物。对于每个降解阶段，对于包含 IS 的系统，分解温度会转移到较低的值。从广义上讲，动力学模型证明活化能 (Ea) 随着 IS 的加入和人工老化的进行而降低。此外，分解机制取决于结合 IS 和人工老化。除了，使用获得的动力学三元组在不同的失效温度下评估了研究样品的寿命。IS 和人工老化过程都会显着降低 PP/PLA 共混物的寿命。