Superior and versatile interface transition layer with a sandwich-like multiscale rigid-soft dual-locked structure for high performance composites

摘要

In order to integrate eco-friendly, flexible and versatile purpose into interphase design strategy, a multiscale rigid-soft dual-locked interface layer with sandwich structure was designed and fabricated to modify the interface between carbon fibers (CFs) and matrix by a facile and green method, with water as the only solvent. Polydopamine (PDA) was chosen as a functional platform to introduce Ni(OH)(2) nanosheets self-assembling onto the CFs surface. After incorporation with a soft and amine-rich polymer, a steadier and more entangled dual-locked interface layer could be realized. The interlaminar shear strength (ILSS) results indicated that the ILSS improved up to 43.38%, compared with untreated CFs composites, the flexural properties represented a dramatic breakthrough, indicating the superiority of this interfacial network. Interestingly, this design strategy could be extended to other system due to the versatile characteristic of PDA and cater different application fields by varying functional nanoparticles.