β Scribed by Changwoon Nah; Je Hwan Park; Choon Tack Cho; Young-Wook Chang; Shinyoung Kaang
No coin nor oath required. For personal study only.
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 95Β°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.
π SIMILAR VOLUMES
Kirwan first made its specific heat 0.05 ; Dalton gave it as the same ; Dulong and Petit obtained 0.0298 by the method of cooling. Regnault obtained 0.03244 (12'-98'), with gold ggg fine. Violle worked with gold 1,000 fine, and obtained for o"-~ooo 0.0316. This is stated to remain sensibly constant