Synthesis of a novel hyperbranched polysiloxane with amidogen groups and the characteristics of a polymer alloy blend with bismaleimide resin

To improve the thermal resistance, mechanical and tribological properties of a bismaleimide (BMI) resin, a novel hyperbranched polysiloxane with terminal functional amidogen groups (HBPSi-NH 2 ) was prepared through a convenient one-step transesterification process. The raw materials included N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (KH-792) and excessive neopentyl glycol. Both Fourier transform infrared spectroscopy and nuclear magnetic resonance spectra were collected to determine the chemical structure of the HBPSi-NH 2 . The novel prepared HBPSi-NH 2 was then used as a modification phase to blend with BMI (HBPSi-BMI), and the thermal properties of the HBPSi-BMI-cured resins were investigated by differential scanning calorimetry and thermogravimetry. The mechanical and tribological properties of HBPSi-BMI were also researched. The results suggested that both the thermal properties and the mechanical properties of HBPSi-BMI increased with the appropriate addition of HBPSi.