A capacitance study of anomalous diffusion of water into HTV silicone rubber materials

摘要

Capacitance and gravimetric measurements are used to study the diffusion of water into high temperature vulcanized (HTV) silicone rubber. Silicone rubber with different Alumina Tri-hydrate (ATH) filler contents was used in this research, and deviations from the classical Fickian diffusion were observed. A model is presented for the calculation of the diffusion coefficient of water in silicone rubber by capacitance method in which the anomalous diffusion mechanism and the water concentration profile are considered. The present model is compared to other models and the difference between the diffusion coefficients obtained is analyzed.