The present work focusses on the analysis of the combined effect of chemical functionalization of graphite nanoplates (GNP) and the melt mixing conditions on the dispersion and localization of the GNP in PC/SAN blends, the composite morphology, and the resulting electrical and mechanical properties. The GNP modification was performed using a mild functionalization method based on the dipolar cycloaddition reaction of azomethyne ylides to the GNP aromatic carbon surface [1]. The functionalization reaction was performed at 250ºC, and its effectiveness was assessed by thermogravimetric analysis, showing a weight loss approximately 10% higher than the corresponding pristine material, at 800ºC when heating the GNP under N2(g) at 10 ºC/min. The Raman spectra of the functionalized GNP (f-GNP) presented a larger area of the D band relative to the original GNP, characteristic of structural modifications induced by covalent functionalization of the sp2 carbon surface. X-ray photoelectron spectroscopy demonstrated the presence of nitrogen at f-GNP surface that may be assigned to pyrrolidine-type functional groups. Previous work performed with carbon nanotubes has shown that their pyrrolidine-functionalized surface react with ester groups (for example in PLA), and carbonate groups in PC, under melt mixing conditions. GNP and f-GNP were melt mixed into PC/SAN = 60/40 wt% blends using a two-step approach with premixing first graphite nanoplates into PC followed by blending with SAN resulting in 1-8 wt% loading of (f-)GNP. Mixing was performed using a small scale twin-screw compounder and plates were obtained by compression molding. Dispersion of (f-)GNP was assessed using light microscopy on the extruded strands; the localization was examined by TEM. In addition, electrical and mechanical properties of the composites were studied and compared to those of the polymer blend. 1. M. Paiva et al. 2010. ASC Nano, 4, 12, 7379.