Abstract: Blends of siloxane and butyl rubbers were prepared via mechanical blending. The influence of butyl rubber content on the mechanical property, thermal stability, and damping properties of the composites were investigated. It was found that, with increasing content of butyl rubber, the mechanical property and thermal stability decreased, but the damping properties increased obviously. When the dosage of butyl rubber were 100 phr, the effective damping temperature range (tanδ>0.3) of the composites was broadened from 0 ℃ to 75 ℃, the maximum loss factor was increased from 0.11 to 0.80, and the glass transition temperature increased by 8 ℃, compared with neat silicone rubber.

Key words: silicone rubber, butyl rubber, loss factor, damping temperature range, blend