Plasticiser Transportation Studies in NR and Acrylonitrile-butadiene Rubber 1. Diffusion Coefficient and Equilibrium Uptake of TBEP in NBR Vulcanisates

摘要

The diffusion coefficients (D) of tributoxyethylphosphate in gum, white- and black-filled vulcanisates of acrylonitrile-butadiene rubber (NBR) determined by means of mass uptake measurements were observed to decrease as crosslink density increases. As filler level increases for black-filled vulcanisates of NBR at fixed sulphur and accelerator levels, D was observed to continuously decrease. D, on the other hand, was found to increase as filler level increases in white-filled vulcanisates of NBR at fixed sulphur and accelerator levels. These observations are explained in terms of degree of rubber-filler interaction.