A novel technique for preparing functionally gradient electrically conductive polymeric composites was developed by using of solution casting technique on the principle of Stokes' law.Acrylonitrilebutadiene-styrene/Cu(ABS/Cu) gradient polymeric composites were prepared successfully using this technique.The gradient structures,electrically conductive performance and mechanical properties of the ABS/Cu composites were investigated.Optical microscope observation shows that the gradient distribution of Cu particles in ABS matrix was formed along their thickness-direction.The electrically conductive testing results indicate that the order of magnitude of surface resistivity was kept in 1015Ω at ABS rich side,while that declined to 105Ω at Cu particles rich side,and the percolation threshold was in the range of 2.82 vol%4.74 vol% Cu content at Cu particles rich side.Mechanical test shows that the tensile strength reduced insignificantly as the content of Cu increases owing to the gradient distribution.
