Ethylene polymerization with silica-supported bis(imino)pyridyl iron(II) catalysts
作者： Z ZHENG , J LIU , Y LI
DOI: 10.1016/J.JCAT.2005.05.022
关键词:
摘要: Two strategies have been developed to prepare silica-supported bis(imino)pyridyl Fe(II) catalysts for ethylene polymerization. The ligands were modified by the introduction of reactive ethoxysilane or SiCl end groups, allowing immobilization them via direct reaction groups with silanols on silica surface. resultant characterized analytical and spectroscopic (NMR, Raman, FTIR, XPS) techniques. complexation reactions supported FeCl2 ⋅ 4H2O give rise precatalysts, which exhibit high catalytic activities polymerization in presence methylaluminoxane (MMAO). molecular weights polyethylenes obtained precatalysts are much higher than those produced corresponding homogeneous precatalyst under same conditions.
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