In this work, polylactide (PLA) was loaded with wood flour (WF) or hazelnut shells (HSs) (10% and 20% of fillers). The matrix and biocomposites were fully characterized from a mechanical and rheological point of view to test their processability and mechanical performance. Compost burial degradation test (30 days), with or without a prior photo‐oxidation step, assessed their biodegradability after an outdoor application, and was monitored by weight loss (WL). The viscosity of the biocomposites was lower than that of the matrix and this unusual result can be attributed to a limited adhesion between the PLA and fillers. Both fillers increased the elastic modulus but decreased the tensile strength and elongation at break. As for the weathering, the degradation of PLA was mostly due to hydrolytic chain scission due to the presence of humidity. Resistance of PLA to UV irradiation improved in presence of both the two fillers. Their lignocellulosic nature was responsible for this behavior. Both fillers induced a high resistance and lower degradation in compost: WL percentages of virgin PLA was about 26%, biocomposites with 20% of WF or HS showed WL of about 10% and 14%, respectively. Photo‐oxidation (36 h with condensation cycle) increased the compost degradation rate of both biocomposites and WL of PLA with 20% of WF or HS were about 15% and 21%, respectively, after 30 days.Highlights Poor adhesion between the matrix and fillers reduced the biocomposites viscosity. Fillers increased the elastic modulus but decreased the properties at break. Both fillers improved the resistance of PLA to UV irradiation. Biocomposites showed a lower susceptibility to compost degradation than PLA. Photo‐oxidation increased the compost degradation rate of biocomposites.

中文翻译：

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用于包装应用的木粉和榛子壳聚丙交酯生物复合材料：表征、光氧化和堆肥掩埋降解

在这项工作中，聚丙交酯 (PLA) 中负载有木粉 (WF) 或榛子壳 (HS)（填料的 10% 和 20%）。从机械和流变学的角度对基质和生物复合材料进行了全面表征，以测试其可加工性和机械性能。堆肥掩埋降解测试（30 天），无论有或没有事先的光氧化步骤，评估其户外应用后的生物降解性，并通过失重 (WL) 进行监测。生物复合材料的粘度低于基质，这种不寻常的结果可归因于 PLA 和填料之间的粘合力有限。两种填料都增加了弹性模量，但降低了拉伸强度和断裂伸长率。至于耐候性，PLA 的降解主要是由于湿度存在导致的水解断链。两种填料同时存在时，PLA 的抗紫外线辐射能力得到改善。它们的木质纤维素性质造成了这种行为。两种填料在堆肥中均具有较高的抵抗力和较低的降解性：原始 PLA 的 WL 百分比约为 26%，含有 20% WF 或 HS 的生物复合材料的 WL 分别约为 10% 和 14%。光氧化（36 小时，冷凝循环）提高了两种生物复合材料的堆肥降解率，30 天后，含有 20% WF 或 HS 的 PLA 的 WL 分别约为 15% 和 21%。 基质和填料之间的粘附力差降低了生物复合材料的粘度。 填料增加了弹性模量，但降低了断裂性能。 两种填料都提高了 PLA 的抗紫外线辐射能力。 生物复合材料对堆肥降解的敏感性低于 PLA。 光氧化增加了生物复合材料的堆肥降解率。