Effects of Particle Size and Amount of Carbon Black and Calcium Carbonate on Curing Characteristics and Dynamic Mechanical Properties of Natural Rubber
Keywords:
Natural Rubber, Carbon Black, Calcium Carbonate, Dynamic Mechanical PropertiesAbstract
This research extensively investigated the effects of particle size and amount of two types of fillers, namely, carbon black and calcium carbonate, on the curing characteristics and dynamic mechanical properties of vulcanized natural rubber. The experimental results indicated that, as the particle size of the carbon black decreased, the Mooney viscosity was increased effectively and the cure and scorch times were shortened. The same effect was obtained when the amount of fillers was increased. It could be assumed that the addition of carbon black decreased tan δmax. The storage modulus (E') was affected by the particle size and the amount of carbon black added. With a small amount of carbon black added, E' was less than that of unfilled rubber. E' increased steadily as the amount of carbon black increased. At a particular amount of carbon black, E' of filled products was equal or larger than E' of unfilled rubber. The tensile modulus at 100% and 300% elongation was increased when tan δmax was decreased. Such relationship could not be established in the case of products filled with calcium carbonate. The particle size and amount of calcium carbonate also had little effects on tan δmax and storage modulus. The glass transition temperature was found to be affected insignificantly.
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