Abstract
Abstract The sorption and diffusion of four aromatic hydrocarbons through vulcanized natural rubber filled with high-abrasion furnace black (HAF) and that filled with silica (Ultrasil VN3) at the same loading have been investigated in the temperature range of 28–70°C by conventional weight-gain experiments. The diffusion results have been analysed in terms of the Fickian diffusion equation. The transport behaviour in both types of samples was found to deviate from the regular Fickian trend, which has been explained in terms of the slow relaxation of rubber chains caused by the presence of fillers. The experimental diffusion data have been compared with the theoretical predictions. The variation of diffusion coefficient with concentration of the solvents has been discussed. From the sorption data, the enthalpy and entropy of sorption and the rubber-solvent interaction parameter have been computed.
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