Enhancements in damping properties and thermal conductivity of acrylonitrile-butadiene rubber by using hindered phenol modified alumina

Highly integrated electronic components used under mechanical vibration usually require the vibration-reduction and heat-dissipation protection from rubber composites. But it is still a challenge to simultaneously improving damping properties and thermal conductivity of rubber. Herein, hindered phenol modified alumina is prepared and filled to acrylonitrile-butadiene rubber (NBR), leading to NBR/modified alumina composites with strong interfacial interaction. The composites exhibit superior damping properties. They have higher hysteresis ratio, damping coefficient, damping factor at 25 degrees C, and effective damping temperature ranges than NBR and its unmodified alumina composites. The NBR/modified alumina composites also have higher thermal conductivity and lower relaxation rate than NBR and its alumina composites. The modification of alumina by the hindered phenol is an effective method for preparing NBR composites with extraordinary combination of good damping properties and high thermal conductivity. The composites have a great application potential for vibration-reduction and heat-dissipation protection of electronic components.