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Low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC) (1:1:1:0.5) were solution blended by using a mixture of solvents consisting of xylene and tetrahydrofuran (THF) (70:30). [Si0.sub.2] nanoparticles were modified by cetyl trimethyl ammonium bromide (CTAB). Wood polymer composites (WPC) were prepared by using polymer mixture, polyethylene-co-glycidyl methacrylate (PE -co-GMA), wood flour, and modified [Si0.sub.2]. X- ray diffraction (XRD) studies showed that the intensity of the peaks of polymer mixture decreased due to incorporation of [Si0.sub.2]. The dispersion of [Si0.sub.2] nanoparticles and morphological characteristics were examined by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The interaction between [Si0.sub.2] nanoparticles, PE-co-GMA, polymer mixture, and wood was studied by Fourier transform infra-red spectroscopy (FTIR). Tensile and flexural properties of the composites improved significantly due to the incorporation of [Si0.sub.2] nanoparticles. Thermal stability, hardness, flame retardancy, and water resistance capacity were also found to enhance. Maximum improvement in properties was observed by the inclusion of 3 phr modified [Si0.sub.2] in WPC. POLYM. ENG. SCI., 52:1516-1523, 2012. © 2012 Society of Plastics Engineers, INTRODUCTION Wood polymer composite (WPC) covers a wide range of area in composite field (1). These are eco friendly, low cost consuming, biodegradable, and renewable (2). The consumption of plastic [...]