Elimination of Environmental Electromagnetic Pollution of Electronic devices By Use of PS/PMMA/Graphene Polymer Blend

During the last decade, electromagnetic fields have saturated our environment due to wide and rapidly growing use of electronic equipment in all over the world and result in electromagnetic environmental pollution which is now strongly felt the need to protect it [1,2]. Polystyrene (PS) and poly(methyl methacrylate) (PMMA) blends filled with surface treated graphenenano-sheets have been fabricated and electromagnetic interference shielding efficiency (EMI-SE) of them studied. The reason of using PMMA is to decrease percolation threshold of the composite by volume exclusion. Graphenenano-sheets will build an electrical conductive network through the composite and is responsible of electical conductivity of the immiscible blend of two dielectric polymers (PS & PMMA) [3]. EMI-SE of polymers is highly coupled with electrical conductivity of polymers, hence graphene will improve EMI-SE of PS/PMMA composite, since graphene is extremely electrical conductive [4]. By prediction of co-continuity window of the mentionedblend and fabricating immiscible blend at the top boundary of co-continuity window of the blend electrical percolation-threshold of 0.3 wt % achieved which is 0.2 wt % lower than the lowest one which reported by Mao et al. who disregard the volume fraction of immiscible blend with co-continuous morphology [3].