Effect of prestretching on dielectric properties of silicone rubber

Abstract

With liquid silicone rubber DC 186 as the matrix, different silicone rubber film materials were prepared by regulating the amount of cross-linking system. The effect of cross-linking degree on mechanical properties of silicone rubber materials and the effects of the prestretching degree and duration on dielectric properties of silicone rubber materials were studied. The results showed that the increase in cross-linking degree could reduce the energy loss in the movement of silicone rubber molecular chain. Because the prestretching reduced the activity of polar groups on the molecular chain and the probability of orientation polarization, the higher the prestretching degree and the longer the prestretching duration, the smaller the dielectric constant of silicone rubber material and the higher the dielectric loss at low frequency.

Keywords

• dielectric elastomer
• silicone rubber
• dielectric property
• cross-linking density
• energy loss
• prestretching