Dynamic mechanical properties of hydrogenated nitrile rubber: effect of cross-link density,curing system,filler and resin

The effect of cross-link density, curing system, filler and resin on dynamic mechanical properties of hydrogenated nitrile rubber (HNBR) is reported. The storage modulus,G, increases and the loss angle, tan , decreases in the plateau zone with cross-link density. At equal cross-link density, the tan peak value at the transition zone of sulphur cured system, is less than that of peroxide cured system. Tan decreases from 90 to 180 °C and increases beyond 180 °C due to post vulcanization reaction and sulphidic linkage cleavage, respectively. The ZSC 2295 resin increasesG and decreases tan , and is found to be compatible with HNBR. The plateau modulus,G, increases with carbon black loading. The tan is lower for high structure carbon black in the transition zone and higher in the plateau zone when the surface area is high.