The extended use of polymers from renewable resources such as aliphatic polyesters or polyhydroxyalkanoates boosted the necessity to understand their behaviour in an end-of-life scenario. Although they can be degraded in reasonable shorter times than traditional polymers, understanding the degradation mechanisms under dissimilar conditions will contribute to further developments in this field. This work aimed to study the effect of temperature and substrate in the degradation of polylactide (PLA) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) (PHBH) in a simulated laboratory scale to ascertain their contribution, separately or in combination. For this purpose, nine parallel degradation assays were performed by means of the combination of mesophilic (25 °C), thermophilic (58 °C) and hyperthermophilic (80 °C) temperatures with enriched synthetic medium, compost and standardised soil substrates. Although the analysis of the surface morphology, the thermal properties and the thermo-oxidative stability revealed changes as a function of time, the evaluation of the molar mass allowed for a more precise determination of the degradation. In general, chain scission was perceived in all cases as a function of time. The effect of temperature was critical, significantly more important than the effect of the substrate, which showed a less significant contribution, especially in terms of molar mass reduction. While for the PLA, biodegradation at 58 °C and thermal degradation at 80 °C resulted in similar consequences, for the PHBH the hyperthermophilic temperature of 80 °C was the most severe condition, regardless of the substrate. From a technological perspective, it may be highlighted that biodegradation at 58 °C may be the most cost-effective condition due to the lower energy supply required and the valuable contribution of the microorganisms.

广泛使用可再生资源中的聚合物，例如脂族聚酯或聚羟基链烷酸酯，这增加了了解其在报废场景中的行为的必要性。尽管它们可以在比传统聚合物短的时间内降解的方法，但了解不同条件下的降解机理将有助于该领域的进一步发展。这项工作旨在在模拟实验室规模下研究温度和底物对聚丙交酯（PLA）和聚（3-羟基丁酸酯-co-3-羟基己酸酯）（PHBH）降解的影响，以确定它们的作用是单独还是组合。为此，结合嗜温（25°C），高温（58°C）和超高温（80°C）的温度，并带有丰富的合成培养基，堆肥和标准化的土壤基质。尽管对表面形态，热性能和热氧化稳定性的分析显示出随时间的变化，但是摩尔质量的评估可以更精确地确定降解。总的来说，断链在所有情况下都是时间的函数。温度的影响至关重要，比底物的影响要重要得多，后者的影响较小，尤其是在降低摩尔质量方面。对于PLA而言，在58°C的温度下生物降解和在80°C的温度下热降解会产生类似的结果，而对于PHBH，80°C的高温温度是最严重的情况，不考虑基材。从技术的角度来看，可能需要强调的是，由于所需的能源供应较低，并且微生物的宝贵贡献，在58°C下进行生物降解可能是最具成本效益的条件。