M Azizi - Islamic Azad University South Tehran Branch, Iran
GH Naderi - Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965-115, Tehran, Iran.
H Bouhendi - Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965-115, Tehran, Iran.
M Ghiass - Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965-115, Tehran, Iran.

Silicone polymers are synthesized by different methods, such as poly condensation and ring opening polymerization[1]. In the present survey we utilized condensation polymerizationmethod for preparation of polydimethylsiloxane in two different conditions; acidic and basic medium by reaction ofdifferent ratios of water and chlorosilane in the presence of sulfuric acid and sodium hydroxide as catalyst. The hydrolysis of chlorosilanes leads to form linear and cyclic oligomers[2]. The aim of this paper is obtaining silicone fluid by low amount of cyclic oligomers and high molecular weight linear polymer