Preparation and damping properties of hindered phenol AO-60/nitrile butadiene rubber-epoxidized natural rubber-natural rubber composites

Hindered phenol AO-60/nitrile butadiene rubber-epoxidized natural rubber-natural rubber composites were prepared by using hindered phenol AO-60/nitrile butadiene rubber (NBR) (mass ratio 40:100) as damping phase and epoxidized natural rubber (ENR) as compatibilizer. It is found that the microstructure of the composites is "sea-island structure" and the co-continuous morphology appears when the mass ratio of NR/NBR is 60:40 and 50:50. The composite exhibit two glass transition temperatures, which occur near -60℃ and around -10℃. With the increase of mass ratio of AO-60/NBR, the effective damping of the composite in the temperature range of -20-40℃ is widened from 0℃ to 35.9℃, and the loss factor increases slightly with increasing strain. The composites exhibit low stress at low strain and exhibits high flexibility. At the same time, it has a stress crack point at higher strain, showing high tensile strength and elongation at break.