APPLICATION OF EPOXIDIZED NR DIAMINE VULCANIZATES FOR TYRE TREAD/

Sulphur vulcanizates of epoxidised natural rubber (ENR) mixed with car bon black in the presence of diamine showed low values of the loss tan gent in the rubbery region, meaning low rolling resistance. The Payne effect was found to be reduced by the addition of diamine, It was esti mated that the decrease of tan delta was due to the enhancement of the crosslinking density and the interaction between ENR and carbon black by the introduction of the diamine, The influence of the types of dia mines on the improvement of ENR compounds was also investigated. Prima ry and alkyl amines were more effective for a reduction of the rolling resistance of ENR compounds than tertiary and the aromatic amines.