Specific heats of rubber compounds

Abstract

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.

The Macromolecular Design of Poly(styrene-isoprene-styrene) (SIS) Copolymers Defines their Performance in Flexible Electrothermal Composite Heaters

“…In each composite mixture, the heat capacity ( C p ) decreases as the CB loading increases (Table S2). This C p reduction occurs primarily due to the inherent characteristics of carbon black, which has a much lower specific heat capacity than the polymer matrix . Among the examined samples, the 3,4-SIS-28CB composite demonstrated the greatest thermal diffusivity and the lowest heat capacity across the 25–150 °C temperature range.…”

“…This C p reduction occurs primarily due to the inherent characteristics of carbon black, which has a much lower specific heat capacity than the polymer matrix. 44 Among the examined samples, the 3,4-SIS-28CB composite demonstrated the greatest thermal diffusivity and the lowest heat capacity across the 25−150 °C temperature range. Using the thermal diffusivity and specific heat capacity, the thermal conductivity for all samples was calculated.…”

Intense luminescence of amorphous Eu2O3 prepared by aqueous sol–gel method

“…Compared to crystal line material, they show more excellent mechanical (high hardness, good elasticity, and wearability) [5], optical [6,7] and electromagnetics qualities [4,8], higher stability [9] and good catalytic performance [10]. These unique properties offer huge potential for many application areas.…”