Modelling of Carbon Black Loadings Effect on the Heat Capacity of SBR and BR

Thermal an d rheometric behaviours of SBR and BR are important in the curing of rubbers. In this study, thermal analysis is used to determine the effect of carbon black (GB) loadings on the reactivity of sulphur in curing reaction, rate constants and heat capacities of rubbers. The heat capacities of SBR and BR are modelled at different loadings of carbon black. This modelling is confirmed by the rheometric studies of carbon black loadings effects on the activation energy of the curing process at different temperatures. The allylic hydrogens of BR and SBR are used to explain the rate constants and activation energies of the curing reactions. A semi-empirical relation is developed for heat capacities of SBR and BR rubbers containing carbon black