The tribological properties of benzoxazine-bismaleimides composites with functionalized nano-SiO₂

To improve the tribological properties of benzoxazine (BOZ) resin, bismaleimides (BMI) resin is chosen as organic phase, hyperbranched polysilane functionalized SiO₂ nanoparticles (HBPSi-SiO₂) are chosen as inorganic modifiers to prepare HBPSi-SiO₂/BOZ-BMI composites using high shear and ultrasonic processes. The effect of content of HBPSi-SiO ₂ on the mechanical properties and tribological properties of the composites are investigated. The results show that suitable addition of HBPSi-SiO₂ can largely enhance the impact strength, reduce the friction coefficient, and wear rate of BOZ-BMI resin. Scanning electron microscopy is employed to research the wearing mechanism of materials. The severe wear of the BOZ pure resin is owing to fatigue wear, and the moderate wear of BOZ-BMI resin is attributed to adhesive wear. While, the mild wear of the composites with HBPSi-SiO₂ is due to abrasive wear.