PROJECT TITLE :

Moisture absorption, desorption, and moisture-induced electrical performances of high-temperature vulcanized silicone rubber

ABSTRACT:

This study focuses on the moisture absorption, moisture desorption, and moisture-induced electrical performances of high-temperature vulcanized (HTV) silicone rubber (SR). The influences of some parameters, such as filler (fumed silica and aluminum hydroxide) characteristics, relative humidity, temperature, tensile stress, and AC electric field, on moisture absorption/desorption are investigated. Results show that the tensile stress accelerates the moisture uptake and will increase the saturated moisture absorption rate of HTV SR, and that the AC electrical field has no important influence on the moisture absorption of HTV SR. The dependencies of the dielectric constant, loss tangent, volume resistivity, AC breakdown strength, depolarization current, and polarization charge of HTV SR on the moisture absorption rate are examined. The depolarization current and therefore the polarization charge as a full increase with the increased moisture absorption rate of HTV SR.