ABSTRACT:The specific heats of rubber compounds are very important not only for the thermodynamic calculations in various rubber processings; mixing, extrusion, calendering, and vulcanization, etc., but also for the service life of the final products under repeated stressing conditions. In this study, the specific heats of various compounding ingredients and their compounds for tires were determined using a differential scanning calorimeter (DSC) in the temperature range from 45 to 95°C. The determined specific heats, C p , were compared with the previous published results for natural rubber (NR), styrene-butadiene rubber (SBR), polybutadiene rubber (BR), and isoprene-isobutyl rubber (IIR). The effects of carbon black loading and vulcanization on the specific heats were investigated. The measured specific heats of the compounds were compared with the calculated values based on the fractional summation of the specific heat of each compounding ingredient.
An investigation on the frictional performance of a natural rubber compound containing polynorbomene (PN) vulcanizate powder was carried out at various temperatures between -20°C and 60°C. The glass transition temperature, Tg, of the PN vulcanizate was 15°C. At temperatures below its Tg, the frictional coefficient of the composite significantly increased to the extent of 10% with a 10 phr addition of PN vulcanizate powder, while the wear rates were not greatly affected. The wear behavior of the composite was strongly dependent on the frictional work input.
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