Variations in the capacitance and dielectric constant of multi-wall carbon nanotube filled silicone rubber composite during compressive creep

Abstract

The changes in the capacitance and the dielectric constant of multi-wall carbon nanotube filled silicone rubber composite during the compressive creep are studied. At the moment of the sudden compression, the capacitance and the dielectric constant decrease instantaneously, and the absolute values of the instantaneous decrements increase with the increase of the sudden compressive pressure. When the compressive pressure holds constant, the capacitance and the dielectric constant increase gradually and tend to be stable over time. Based on the viscoelastic theory, the mathematical model for the variations in the dielectric constant during the compressive creep is established. With the increase of the sudden compressive pressure, the dielectric constant retardation times hold constant and the stable normalized dielectric constant increases. With the increase of the carbon nanotube volume percent, the dielectric constant retardation times and the stable normalized dielectric constant decreases.