Hamid Reza Azimi - Institute of Polymeric Materials, Polymer Engineering Department, Sahand University of Technology, P.O.Box 51335-1996,Tabriz, Iran
Mostafa Rezaei - Institute of Polymeric Materials, Polymer Engineering Department, Sahand University of Technology, P.O.Box 51335-1996,Tabriz, Iran
Mostafa Salehi - Institute of Polymeric Materials, Polymer Engineering Department, Sahand University of Technology, P.O.Box 51335-1996,Tabriz, Iran

Thermoplastic foam products have become very popular in recent years. In this foam, the porous structure is achieved using the expansion of a blowing agent dissolved in athermoplastic matrix through a thermodynamic instability [1- 4] In this study, we synthesized St-MMA copolymer particlesin three compositions by suspension polymerization process to investigate the foaming dynamics via visual batch foaming apparatus and examine the effect of different foamingconditions, like temperature, impregnation pressure and MMA content in copolymer, on the foaming ratio of the synthesizedcopolymer. The cellular morphology also was investigated under different conditions by scanning electron microscopy (SEM).