Matrenichev Vsevolod, Lessa Belone Maria Clara, Palola Sarianna, Laurikainen Pekka, Sarlin Essi
Engineering Materials Science, Tampere University, FI-33014 Tampere, Finland.
Materials (Basel). 2020 Dec 17;13(24):5773. doi: 10.3390/ma13245773.
Most recycling methods remove the essential sizing from reinforcing fibres, and many studies indicate the importance of applying sizing on recycled fibres, a process we will denote here as resizing. Recycled fibres are not continuous, which dissociates their sizing and composite lay-up processes from virgin fibres. In this study, commercial polypropylene and polyurethane-based sizing formulations with an aminosilane coupling agent were used to resize recycled glass and carbon fibres. The impact of sizing concentration and batch process variables on the tensile properties of fibre-reinforced polypropylene and polyamide composites were investigated. Resized fibres were characterized with thermal analysis, infrared spectroscopy and electron microscopy, and the tensile properties of the composites were analysed to confirm the achievable level of performance. For glass fibres, an optimal mass fraction of sizing on the fibres was found, as an excess amount of film former has a plasticising effect. For recycled carbon fibres, the sizing had little effect on the mechanical properties but led to significant improvement of handling and post-processing properties. A comparison between experimental results and theoretical prediction using the Halpin-Tsai model showed up to 81% reinforcing efficiency for glass fibres and up to 74% for carbon fibres.
大多数回收方法会去除增强纤维上的基本浸润剂，许多研究表明对回收纤维施加浸润剂的重要性，在此我们将此过程称为重新浸润。回收纤维不连续，这使其浸润剂施加和复合材料铺层过程与原始纤维不同。在本研究中，使用含有氨基硅烷偶联剂的商用聚丙烯和聚氨酯基浸润剂配方对回收的玻璃纤维和碳纤维进行重新浸润。研究了浸润剂浓度和批量工艺变量对纤维增强聚丙烯和聚酰胺复合材料拉伸性能的影响。对重新浸润的纤维进行了热分析、红外光谱和电子显微镜表征，并分析了复合材料的拉伸性能以确认可达到的性能水平。对于玻璃纤维，发现了纤维上浸润剂的最佳质量分数，因为过量的成膜剂具有增塑作用。对于回收碳纤维，浸润剂对机械性能影响不大，但显著改善了加工和后处理性能。实验结果与使用Halpin-Tsai模型的理论预测之间的比较表明，玻璃纤维的增强效率高达81%，碳纤维高达74%。
