Sorption and Diffusion of a Brake Fluid in EPDM Elastomers

摘要

This article reports on S;n investigation into how the morphology of four commercially available etpylene propylene diene monomer (EPDM) elastomers was affected by exposure to a brake fluid. The sorption and diffusion coefficients as a function of carbori-black content as well as the EPDM type were determined at 23°C, 60°C, loo°C and 150°C. It was founqthat variation incarbon-black loading showed an effect on the transP.ort characteristics of EPDM e.Iastomers. The sorption data at room temperature were not reported since these took too long a time. The leaching out of the indigenous additives might be due to the par~n oitmigrating to the surface of the specimens. The diffusion of the brake fluid in the EPDM membranes follows non- Fickian transport. The results of this investigation are discussed in terms of the morphological differences in the EPDM formulations. The diffusion coefficients showed a dependence on the morphology of EPDM, as studied by the glass-transition temper- ature of the elastomers.