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

The thermal properties (thermal conductivity lambda, thermal diffusivity a, and specific heat C-p) as well as the dielectric constant epsilon' and dielectric loss epsilon' of conductive styrene butadiene rubber loaded with different concentrations of sulphur were measured. It was found that both lambda and C-p increase gradually at around I phr of sulphur content. Meanwhile, the dielectric constant epsilon', showed a pronounced peak at 2 phr of sulphur content. Moreover the effect of hydrostatic pressure on the dielectric constant epsilon' and dielectric loss epsilon' was found to rise with pre-compression. Copyright (C) 1996 Elsevier Science Ltd