Study on Percolation Threshold of Silicone Rubber Conductive Composite filled with Silver-coated Glass Beads

The mechanical properties and the conductivity of silicone rubber composite filled with silver-coated glass beads were investigated in this paper.It was found that the mechanical properties of the composite were getting bad with the increase of addition of silver-coated glass beads,and the volume resistivity of the composite decreased,When the volume fraction of silve-coated glass beads was 38.8%,the composite transformed from the insulator into conductor,and presented an obvious percolation threshold.There was a slight inflexion in the curve of volume resistivity at the volume fraction was 46%.The existence of percolation threshold of the composite had much to do with the formation of rubber conductive net.