“…It is known that by the use of a compatibilizer, the morphology of immiscible blends can be stabilized through suppressing coalescence and enhancing interfacial adhesion which results in a finer droplet size (Huitric et al, 2009). During the last decades, block, graft or random copolymers have been used as the compatibilizers for immiscible polymer blends to prevent phase separation (Ramesan and Rosamma, 2001;Botros et al, 2006;Khalf et al, 2010;Noriman et al, 2010); however in recent years, using inorganic nanoparticles, as the compatibilizer have attracted particular attention (Wang et al, 2001;Steinmann et al, 2002;Gu et al, 2004;Elias et al, 2007). For instance, Elias et al (2007) investigated the effect of hydrophilic and hydrophobic silica on morphology and rheology of the polypropylene/polystyrene (PP/PS) and also PP/ethylene vinyl acetate (EVA) blends and reported a significant reduction of the dispersed phase droplets size in the presence of only 3 wt.% of both types of silica.…”