Electrical Conductivity of Cu-Powder Dispersed Polymer Composites Prepared by Solution-Cast

Cu-powders dispersed poly-methyl methacrylic acid (acrylic resin, PMMA) was prepared by solution-cast, which could easily control the dispersion ratio. The Cu addition gradually enhanced the electrical conductivity at less and more than the critical volume fraction (15.0±1.0 vol%Cu) in PMMA. The jump of electrical conductivity was observed by the Cu addition at the critical volume fraction. Although the result was mostly explained by the percolation theory, the critical Cu volume fraction to convert the high conductivity of PMMA composite is 4.0 vol% lower than that of ABS composites.