CONICET | Buscador de Institutos y Recursos Humanos

Gravimetric and dielectric measurements have been used to monitor water uptake in composites with glass, jute and washed jute fibers. The results showed that the dielectric constant of jute fibers composites is higher than the composites based on glass fibers. Also, when the frequency increases the permittivity decreases. A Fickian diffusion model was applied and the effective diffusion coefficient was calculated. The results obtained show that when the sizing is removed in fibers washed with hot water, the effective coefficient diffusion increases. Changes in the dielectric permittivity were measured at different frequencies and at different times during water absorption processes at room temperature. A non-linear behavior has been found in the changes of the permittivity with water absorption in the range frequency of 200 Hz to 1 MHz.