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Nanocomposites of high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), polystyrene (PS) and polycarbonate (PC) with thermally reduced graphene were generated by melt mixing. The HDPE nanocomposites had increment in the tensile (>50%) and storage modulus as a function of filler fraction. LLDPE had the highest enhancements of ≈100% in tensile modulus, 60% in break stress and 30% in tensile stress. PS exhibited least extent of property improvement, though the absolute modulus and strength were the highest for PS nanocomposites indicating the final properties of nanocomposites result from a combination of factors like polarity match between polymer and filler, processing conditions and physical properties of the polymer matrix.