%0 Journal Article %T Preparation of Ultra High Molecular Weight Polyethylene Using Bi- supported Sio2/Mgcl2 (spherical)/Ticl4 Catalyst: A MorphologicalStudy %A Zohuri, Gholamhossein %A Ahmady Bonakdar, Mahboobe %A , %A Eftekhar, Melika %A Askarizadeh Khanaman, Mahdiye %A S.Ahmadjo %J Iranian Polymer Journal %@ 1026-1265 %D 2009