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Mechanical Recycling of PLA Filled with a High Level of Cellulose Fibres

机译：机械回收高含量纤维素纤维的PLA

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摘要

Composites consisting of 30 vol% PLA and 70 vol% cellulose fibres were prepared with compression moulding. In the first part of the study, the recyclability of this composite material was investigated by grinding the material and using the recyclate obtained as a filler for PLA. Thus, the recyclate was compounded with PLA in loadings ranging from 20 to 50 wt%. The composites obtained were characterised by tensile tests, Charpy impact tests, DMTA, and SEM. Tests showed that the recyclate had a relatively good reinforcing effect. Stress at break increased from about 50 to 77 MPa and the modulus increased from 3.6 to 8.5 GPa. In the second part of the study, the ability to mechanically recycle the composites obtained was evaluated by repeated processing. Composite with two loadings of the recyclate (20 wt% and 50 %) was injection moulded repeatedly, six times. Tests showed that the composite material with 20 wt% recyclate could withstand six cycles relatively well, while the composite with the higher load degraded much more quickly. For the composites with 50 wt% recyclate, signs of polymer degradation could be seen already after reprocessing the composite once.
机译：由30体积％的PLA和70体积％的纤维素纤维组成的复合材料通过压模制备。在研究的第一部分中，通过研磨复合材料并使用所得的回收物作为PLA的填料，研究了这种复合材料的可回收性。因此，将再循环物与PLA混合，负载量为20至50重量％。通过拉伸试验，夏比冲击试验，DMTA和SEM来表征获得的复合材料。试验表明，回收物具有相对较好的增强作用。断裂应力从约50 MPa增加到77 MPa，模量从3.6 GPa增加到8.5 GPa。在研究的第二部分中，通过重复加工评估了机械回收所得复合材料的能力。将具有两次加载量的回收物（20 wt％和50％）的复合材料重复注塑六次。测试表明，具有20 wt％回收率的复合材料可以相对较好地承受6个循环，而具有较高负载的复合材料降解得更快。对于具有50wt％的再循环物的复合材料，在将复合材料再处理一次之后，已经可以看到聚合物降解的迹象。

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