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首页> 外文期刊>Polymer Degradation and Stability >Thermal analysis applied to the characterization of degradation in soil of polylactide: II. On the thermal stability and thermal decomposition kinetics
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Thermal analysis applied to the characterization of degradation in soil of polylactide: II. On the thermal stability and thermal decomposition kinetics

机译：热分析用于表征聚丙交酯在土壤中的降解：II。关于热稳定性和热分解动力学

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摘要

The disposal stage of polylactide (PLA) was assessed by burying it in active soil following an international standard. Degradation in soil promotes physical and chemical changes in the polylactide properties. The characterization of the extent of degradation underwent by PLA was carried out by using Thermal Analysis techniques. In this paper, studies on the thermal stability and the thermal decomposition kinetics were performed in order to assess the degradation process of a commercial PLA submitted to an accelerated soil burial test by means of multi-linear-non-isothermal thermogravimetric analyses. Results have been correlated to changes in molecular weight, showing the same evolution as that described by the parameters of thermal stability temperatures and apparent activation energies. The decomposition reactions can be described by two competitive different mechanisms: Nucleation model (A2) and Reaction Contracting Volume model (R3). The changes in the kinetic parameters and kinetic models are in agreement with the calorimetric and dynamic-mechanical—thermal results, presented in the Part I of the study [1].
机译：聚丙交酯（PLA）的处理阶段是通过按照国际标准将其埋在活跃的土壤中进行评估的。土壤中的降解促进了聚丙交酯性质的物理和化学变化。通过使用热分析技术对PLA降解的程度进行了表征。在本文中，进行了热稳定性和热分解动力学的研究，以评估通过多线性-非等温热重分析法进行加速土壤埋藏试验的商业PLA的降解过程。结果与分子量的变化相关，显示出与热稳定性温度和表观活化能参数所描述的相同的演变。分解反应可以通过两种竞争机制来描述：成核模型（A2）和反应收缩体积模型（R3）。动力学参数和动力学模型的变化与研究的第一部分中介绍的量热法和动态力学热结果一致。

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