High performance polymer matrix composites based on poly(phenylene sulphide) (pps) as matrix andmicro- / nano copper (cu)as reinforcements were studied for the electronic applications. the micro- and nanocomposites were fabricated using planetary ball milling/hand mixing methods followed by hot pressing. the content of micro- and nano cu was 30 wt%, 40 wt%, 50 wt% and 60 wt% in the pps matrix. the microhardness was increased by more than 25% compared to pure pps matrix. electrical conductivity of the hand mixed microcomposites showed an increment of 13 orders of magnitude while those prepared by ball milling showed an increment of 2 orders of magnitude for the samewt% (60 wt%). this huge difference in the conductivity of composites prepared by different techniques is attributed to the dispersion of cu particles in the pps matrix.the conductivity of the 60 wt% cu filled nanocomposite prepared by hand mixing showed 3 orders of magnitude increment while that prepared by ball milling showed just 1 order of magnitude increment. low conductivity of the nanocomposites was due to the presence of cuprous oxide layer on nano cu particles. surface resistance and ac conductivity were also studied for the micro- and nanocomposites prepared by both methods, which showed the similar trend as the dc conductivity.