Polystyrene (PS) composites with a network of single-walled carbon nanotubes (SWNTs) were fabricated by using monodispersed PS micospheres. First, PS spheres and surfactant-dispersed SWNTs were mixed in water, then a hybrid cake was obtained by filtration via a microporous membrane and the SWNTs were filled within the spaces of packed polymer spheres. At this stage, the surfactants for dispersing SWNTs were totally removed from the composites by a thorough washing. Then the composite films with SWNT networks were obtained by compression molding at 160 degrees C. Structure of the composites had been characterized by transmission electron microscopy and scanning electron microscopy. The present SWNT composites showed a low percolation threshold of electrical conductivities. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 155-161, 2011