Abstract
The fatigue, resilience and hardness properties of natural rubber/epoxidized natural rubber (SMR L/ENR 25) and natural rubber/styrene-butadiene rubber (SMR L/SBR) blends were studied with a blend ratio from 0 to 100% rubber. A semi-efficient vulcanization system was used throughout the study. The cure time of the rubber compound was determined by using the Moving-Die Rheometer (MDR 2000). The fatigue life of the unaged and aged samples was determined by using a Fatigue To Failure Tester (FTFT), whereas the unaged samples of resilience and hardness were measured by a Wallace Dunlop Tripsometer and a Wallace Dead Load Hardness Tester, respectively. Results indicate that before ageing, fatigue life passes through a maximum at 50% ENR and SBR for both blends. This observation is attributed to the “synergistic” effect of mutual reinforcement due to strain-induced crystallization in the former system, whereas for the latter system, compatibility accounts for the observed maximum. Ageing lowers the fatigue life for both blends, a phenomenon which is associated essentially with the breakdown of crosslinks. Resilience decreases with increasing blend ratio, whereas the reverse behaviour is observed for the hardness experiment.
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