In situ growth of TiO2 nanoparticles onto PBO fibers via a mussel-inspired strategy for enhancing interfacial properties and ultraviolet resistance

摘要

In this work, to overcome the poor interfacial adhesion and ultraviolet (UV) resistance of poly(p-phenylene benzobisoxazole) (PBO) fiber simultaneously, a new hierarchical reinforcement was fabricated by in situ growing titanium dioxide (TiO2) nanoparticles on the surface of the fiber using mussel-inspired polydopamine (PDA) as a robust reaction platform. The surface morphologies and chemical compositions of the modified fiber were measured to prove the TiO2 binding. The interfacial shear strength of PBO fiber-reinforced epoxy resin composite had a 57.2% enhancement after TiO2 modification, which was caused by increased surface roughness (R-a) and wettability. In addition, the thermal stability of the fiber and hygrothermal aging resistance of the composite were improved remarkably. Moreover, the compact TiO2 coating on the surface of PBO/PDA/Ti led to excellent UV resistance.