Environmentally Friendly Sizing Strategy for PBO Fiber-reinforced Composites through Building Carbon Nanosphere Coatings

摘要

Sizing treatment has shown great potential in improving the interfacial properties of poly(p-phenylene benzodioxazole)(PBO)fiber-reinforced composites,but is severely limited due to the use of flammable and explosive organic solvents.Herein,a new high-efficiency waterborne sizing agent has been developed by using functionalized carbon nanospheres(CNSs)as a nano-reinforcement.Due to abundant oxygen-containing groups,the CNSs greatly improves the surface activity,wettability,and roughness of the PBO fibers.As a result,the interfacial shear strength of the CNSs sized fiber-reinforced composite increases by 79.6%compared with that of the pristine fiber-reinforced composite.Moreover,the excellent mechanical and thermal properties of the PBO fibers remain almost unchanged after sizing treatment.Thus,this work provides an environmentally friendly and scalable method for constructing a strong interface between the PBO fibers and the matrix resins,which makes sense in promoting the application of PBO fiber-reinforced composites in aerospace and military industries.