Nucleation in the extrusion foaming; investigation the effect of the nanosilica amount

Extrusion foaming is an important process to engineer and change polymer structure to obtain desired properties [1]. Cell number density and cell size of foam are two parameters thatchange produced foam properties [2]. Nanoparticle has a great impact on the foam structure [3]. In this study the nucleationof gas bubbles in extrusion foaming of polystyrene-nitrogennanosilica system has considered. A simple model for estimating the number density of supercritical nuclei has proposed and the effect of the nanosilica content on the cell density in the final foam has experimentally examined and discussed