Nickel-silicone rubber composites were prepared using nickel powder of different sizes( 0. 15,0. 2,0. 3,3and 18 μm) and silicone rubber at the ratio of 2. 8∶ 1 by weight. The effect of pressure on the piezoresistivity and dielectric properties of the composite samples at room temperature were measured. The results showed that the piezoresistivity of the nickel-silicone rubber composites decreased abruptly as nickel particle size was reduced to less than 0. 3mm.The ac conductivity,dielectric constant and los...