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Valorization of Cotton Industry Byproducts in Green Composites with Polylactide

机译：用聚丙环糖苷的棉花产业副产品副产品

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摘要

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.
机译：基于聚丙烯（PLA）和棉工业副产物的新型可持续的绿色复合材料通过挤出成功制造，随后通过常规注射成型制造。使用棉籽面粉作为增强填料和改性的棉籽油（环氧化和马来因的棉籽油，ECSO和MCSO）用于改善界面之间的填充聚合物基质相互作用。通过标准拉伸，弯曲，肖氏D硬度和影响夏比试验获得机械性能，而通过使用现场发射扫描电子显微镜进行裂缝样本的表面形态表征。通过差示扫描量热法得到热性能，并评估所得复合材料的动态力学行为对棉籽粉和化学改性的棉籽油的影响。与典型的木质纤维素填料不同，由于应力浓度现象，15wt％的棉籽面粉不会导致更脆的材料。实际上，与没有任何其他增容剂的整洁PLA相比，棉籽面粉在断裂（机械延迟性能下）提供改善的韧性和伸长率。加入环氧化和马来因的棉籽（7.5wt％）对改善复合材料的延性行为具有积极影响，从而导致新的绿色复合材料在加工性和整体性质之间具有良好的平衡。特别地，由于PLA是本质上，脆性聚合物，因此显着提高了冲击强度在这些复合材料中起键因子。

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  • 来源
    《Journal of Polymers and the Environment》 |2020年第7期|2039-2053|共15页
  • 作者

    Carbonell-Verdu A.; Boronat T.; Quiles-Carrillo L.; Fenollar O.; Dominici F.; Torre L.;

  • 作者单位

    Univ Politecn Valencia UPV Inst Tecnol Mat ITM Plaza Ferrandiz & Carbonell S-N Alicante 03801 Spain;

    Univ Politecn Valencia UPV Inst Tecnol Mat ITM Plaza Ferrandiz & Carbonell S-N Alicante 03801 Spain;

    Univ Politecn Valencia UPV Inst Tecnol Mat ITM Plaza Ferrandiz & Carbonell S-N Alicante 03801 Spain;

    Univ Politecn Valencia UPV Inst Tecnol Mat ITM Plaza Ferrandiz & Carbonell S-N Alicante 03801 Spain;

    Univ Perugia Dipartimento Ingn Civile & Ambientale Perugia Italy;

    Univ Perugia Dipartimento Ingn Civile & Ambientale Perugia Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Polylactide; Cottonseed oil; Cottonseed meal; Natural fillers;

    机译：聚丙烯酯;棉籽油;棉籽粕;天然填料;

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