Effect of sulphur on both thermal and dielectric properties of pre-compressed FEF black-loaded SBR vulcanizates

Abstract

The thermal properties (thermal conductivity λ, thermal diffusivity a, and specific heat C p ) as well as the dielectric constant ϵ′ and dielectric loss ϵ′ of conductive styrene butadiene rubber loaded with different concentrations of sulphur were measured. It was found that both λ and C p increase gradually at around 1 phr of sulphur content. Meanwhile, the dielectric constant ϵ′, showed a pronounced peak at 2 phr of sulphur content. Moreover, the effect of hydrostatic pressure on the dielectric constant ϵ′ and dielectric loss ϵ′ was found to rise with pre-compression.