Interfacial enhancement of CF/PEEK composites by modifying water-based PEEK-NH2 sizing agent

In this study, a series of soluble aminated polyether-ether-ketone (PEEK-NH 2 ) with good compatibility were designed. Novel water-based sizing agents were then prepared by emulsion/solvent evaporation method, which were selected as CF surface modifiers to improve the interfacial properties of CF/PEEK composites. TGA and DSC results showed that PEEK-NH 2 exhibit excellent thermal properties, and the T g was increased by up to 30.9 °C. The particle diameters of sizing agents range from 54.3 to 73.6 nm, and the contact angles of modified CF were significantly decreased. According to the interfacial properties results, PEEK–NH 2 –35 presented the most effective reinforcing effect, the interlaminar shear strength and flexural strength were increased by 43.1% and 62.2%, as compared to un-sized CF composites . Moreover, the interfacial strengthening mechanisms of sizing agent was investigated. The improved interfacial adhesion benefits from PEEK-NH 2 which performs as effective stress transfer bridge at the interface.