Abstract Polyethylene terephthalate (PET) with their low cost, desirable mechanical, physical, and thermal properties and growing commercial applications is widely used in different fields from packaging films, bottles and containers to automotive parts. In all of these applications, the surface of PET needs to be printed (or painted for automotive particularly). Because of its relatively low surface energy due to its molecular structure, lack of hydrophilicity and suitable active functional groups, inks and paints do not adhere properly directly to the surface of PET film and the films surface cannot be painted or printed. Different methods have been reported to change the surface properties in order to get more hydrophilic polymer surface. Each of these techniques has disadvantages regarding the type of the process and its stability. One of the worst disadvantages of these methods is to modify an intricate shaped surface (such as automotive components), the uniform modification cannot be achieved. According to consideration about all possible methods that were mentioned, The process of the melt blending of additives and polymers in the host polymer to migrate them from the bulk to the surface is a promising method for improving the surface properties of polymer. This project will involve studying of possible interactions between PET and other materials leading to a hydrophilic surface through their migration to the surface. For this purpose, different polymers were melt-extruded with a twin-screw extruder using different concentrations to investigate how hydrophilic surfaces are created. It was seen that the blend of PEG and PET through twin screw extruder could increase the surface energy and the polar contribution of the PET film due to the migration of PEG to the surface resulting in increase in surface wettability. One idea that is explored is the use of a third material to interact with PET more than PEG, thus to push PEG to the air-polymer interface. New su