Poly(<i>p</i>-phenylene benzobisoxazole) Fiber/Epoxy Composites Reinforced with Carbon Nanotubes and Graphene Oxide for Enhanced Interfacial Adhesion and Mechanical Strength
Bo Song, Zhide Liu, Lei Chen, Lichun Ma, Yudong Huang
Abstract
Herein, CNT and GO were used to construct the multiscale-reinforced interphase of the PBO fiber composite for exploring their action in the interfacial adhesion and overall mechanical performance. Compared to the grafting CNT or GO, the cografting of CNT/GO shows better interfacial regulation including increased surface wettability of fiber, enhanced interfacial adhesion, and improved failure resistance of the interfacial region. The interface structure of GO@CNT endows the composites with significantly improved interfacial adhesion. The IFSS and ILSS increased by 20.75 (or 31.42)% and 32.85 (or 51.64)%, respectively, compared to the interphase of CNT (or GO). The reinforcing effect of CNT/GO also leads to the improvement in mechanical features, interfacial load transfer, local stress elimination, and crack propagating inhibition of the interphase. The impact strength of PBO–GO@CNT composite increased from 67.25 to 106.78 kJ/m2. The strategy of interfacial engineering developed by our study will play a crucial role in the field of structural materials, flexible sensors, supercapacitors, catalysts, and energy conversion and storage materials.