Palola Sarianna, Laurikainen Pekka, García-Arrieta Sonia, Goikuria Astorkia Egoitz, Sarlin Essi
Materials Science and Environmental Engineering, Faculty of Engineering and Natural Sciences, Tampere University, FI-33014 Tampere, Finland.
Tecnalia, Basque Research and Technology Alliance (BRTA), Mikeletegi Pasealekua, 2, E-20009 Donostia-San Sebastián, Spain.
Polymers (Basel). 2022 Mar 9;14(6):1098. doi: 10.3390/polym14061098.
Currently, the vast majority of composite waste is either landfilled or incinerated, causing a massive burden on the environment and resulting in the loss of potentially valuable raw material. Here, conventional pyrolysis and reactive pyrolysis were used to reclaim carbon fibers from aeronautical scrap material, and to evaluate the feasibility of using reclaimed carbon fibers in structural components for the automotive sector. The need for fiber sizing was investigated as well as the behavior of the fiber material in macroscopic impact testing. The fibers were characterized with the single fiber tensile test, scanning electron microscopy, and the microbond test. Critical fiber length was estimated in both polypropylene and polyamide matrices. Tensile strength of the fiber material was better preserved with the reactive pyrolysis compared to the conventional pyrolysis, but in both cases the interfacial shear strength was retained or even improved. The impact testing revealed that the components made of these fibers fulfilled all required deformation limits set for the components with virgin fibers. These results indicate that recycled carbon fibers can be a viable option even in structural components, resulting in lower production costs and greener composites.
目前，绝大多数复合废料要么被填埋，要么被焚烧，这给环境带来了巨大负担，并导致潜在有价值的原材料流失。在此，采用传统热解和反应性热解从航空废料中回收碳纤维，并评估在汽车领域的结构部件中使用回收碳纤维的可行性。研究了纤维上浆的必要性以及纤维材料在宏观冲击试验中的行为。通过单纤维拉伸试验、扫描电子显微镜和微粘结试验对纤维进行了表征。在聚丙烯和聚酰胺基体中均估计了临界纤维长度。与传统热解相比，反应性热解能更好地保留纤维材料的拉伸强度，但在两种情况下，界面剪切强度都得以保留甚至提高。冲击试验表明，由这些纤维制成的部件满足了为使用原生纤维的部件设定的所有所需变形极限。这些结果表明，即使在结构部件中，回收碳纤维也可能是一种可行的选择，从而降低生产成本并生产更环保的复合材料。
