The critical issue and challenge in reusing recycled carbon fiber (rCF) was to fully exerting its outstanding properties via an efficient and environmental-friendly way. In this study, the strengthening effects of polydopamine surface-modified recycled short CF (pDop-rSCF) on mechanical, thermo-mechanical, electrical and electromagnetic properties of epoxy (EP)-based composites were systematically evaluated. The dispersibility of pDop-rSCF in suspension used for fabricating nonwoven mat was quantitatively characterized with crowding factor N, dispersion coefficient β and fractal dimension D. Significant enhancements were achieved in tensile and flexural properties, interlaminar shear strength, storage modulus and electromagnetic interference shielding capability of EP composites reinforced with pDop-rSCF nonwoven mat, which was primarily ascribed to chemically strengthened interfacial bonding between pDop-rSCF and EP matrix and the increased connectivity among pDop-rSCFs with excellent dispersion.

重复使用再生碳纤维（rCF）的关键问题和挑战是如何通过有效和环保的方式充分发挥其出色的性能。在这项研究中，系统评价了聚多巴胺表面改性的再生短CF（pDop-rSCF）对基于环氧树脂（EP）的复合材料的机械，热机械，电和电磁性能的增强作用。用拥挤系数N，分散系数β和分形维数对pDop-rSCF在悬浮液中的分散性进行了定量表征。拉伸和弯曲性能，层间剪切强度，储能模量和电磁干扰屏蔽能力得到了显着提高pDop-rSCF无纺布垫增强的EP复合材料的制造，