Tribology Property of Benzoxazine-Bismaleimide Composites with Hyperbranched Polysilane-Grafted Multi-Walled Carbon Nanotubes

To reveal the wear mechanism of hyperbranched polysilane (HBPSi) grafted multi-walled carbon nanotubes (HBPSi-MWCNTs) modified benzoxazine-bismaleimide (BOZ-BMI) resin (HBPSi-MWCNTs/BOZ-BMI), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA) were employed. The results indicated that the suitable addition of HBPSi-MWCNTs could largely enhance the tribological properties of BOZ-BMI composites. The worn surface of the composites showed that the severe wear of the BOZ-BMI resin was converted from adhesive wear to abrasive wear with the addition of HBPSi-MWCNTs. The excellent tribological properties can be attributed to the improved interfacial adhesion between HBPSi-MWCNTs and the BOZ-BMI resin matrix. The TGA demonstrated that the composite with 0.8wt.% HBPSi-MWCNTs exhibits better thermal resistance; thus, it can inhibit adhesive wear during the friction process. The XPS spectra and the surface energy showed that the HBPSi-MWCNTs could be exposed on the worn surface of the composite to improve the anti-wear capacity of the composites further.