New sustainable green composites based on polylactide (PLA) and cotton industry byproducts were successfully manufactured by extrusion, and subsequently by conventional injection molding. Cottonseed flour was used as reinforcement filler and modified cottonseed oil (epoxidized and maleinized cottonseed oil, ECSO and MCSO respectively) were used to improve filler-polymer matrix interactions among the interface. Mechanical properties were obtained by standard tensile, flexural, Shore D hardness and impact Charpy tests, while the surface morphology characterization on fractured specimens was carried out by using field emission scanning electron microscopy. Thermal properties were obtained by differential scanning calorimetry and the effect of both cottonseed flour and chemically-modified cottonseed oil was evaluated on dynamic mechanical behavior of the obtained composites. Unlike typical lignocellulosic fillers, 15 wt% cottonseed flour does not lead to more brittle materials due to stress concentration phenomena. In fact, cottonseed flour provides improved toughness and elongation at break (mechanical ductile properties) compared to neat PLA without any other compatibilizer. Addition of both epoxidized and maleinized cottonseed (7.5 wt%) has a positive effect on improving ductile behaviour of composites, thus leading to new green composites with good balance between processability and overall properties. In particular, the impact strength is remarkably improved which plays a key factor in these composites since PLA is, intrinsically, a brittle polymer.

基于聚丙交酯（PLA）和棉花行业副产品的新型可持续绿色复合材料通过挤出，然后通过常规注塑成型成功制造。棉籽粉用作增强填充剂，改性棉籽油（分别为环氧化和马来化棉籽油，分别为ECSO和MCSO）用于改善界面之间的填料-聚合物基体相互作用。通过标准拉伸，挠曲，肖氏D硬度和冲击夏比测试获得机械性能，同时使用场发射扫描电子显微镜对断裂试样的表面形态进行表征。通过差示扫描量热法获得热性能，并且评价了棉籽粉和化学改性棉籽油对所得复合材料的动态力学性能的影响。与典型的木质纤维素填充剂不同，15 wt％的棉籽粉不会由于应力集中现象而导致变脆。实际上，与不含任何其他增容剂的纯PLA相比，棉籽粉具有更高的韧性和断裂伸长率（机械韧性）。同时添加环氧化棉和马来酸棉籽（7.5 wt％）对改善复合材料的延展性具有积极作用，从而导致在可加工性和总体性能之间取得良好平衡的新型绿色复合材料。尤其是，