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Homogeneous polymerization of ethylene using an iron‐based metal catalyst system
Author(s) -
Mahdavi Hossein,
Badiei Alireza,
Zohuri Gholam Hossein,
Rezaee Abbas,
Jamjah Roghieh,
Ahmadjo Saied
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.24949
Subject(s) - polymerization , molar mass distribution , coordination polymerization , polymer chemistry , catalysis , crystallinity , polyethylene , ethylene , molar mass , polymer , materials science , monomer , bulk polymerization , melting point , chemistry , solution polymerization , organic chemistry , radical polymerization , composite material
An iron‐based catalyst of 2,6‐ bis ‐[1‐(2‐methylphenylimino)ethyl]pyridine iron dichloride was prepared. The ligand was prepared using 2,6‐diacetylpyridine as the starting chemical under controlled conditions. The preparation procedure was followed using 13 C‐NMR, 1 H‐NMR, FT‐IR, MS (mass spectroscopy), and elemental analysis methods. The homogeneous polymerization of ethylene was carried out using the prepared catalyst in toluene media. Methyl aluminoxane (MAO) was used as a cocatalyst. The effect of the [Al] : [Fe] molar ratio, polymerization temperature, and monomer pressure of 202,000 to 454,500 Pa on the polymerization behavior were studied. The highest activity of the catalyst was obtained at 30°C, the activity decreased with increasing temperature, while increasing pressure linearly increased its activity. The molecular weight distribution of the polyethylene obtained was 1.25 to 1.72. A weight average molecular weight of 7.1 × 10 4 and 1.5 × 10 3 were obtained. The crystallinity of the polymer was about 19% and its melting point was about 65°C. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1517–1522, 2007