Kinetic Features of Ethylene Polymerization over Supported Catalysts [2,6-Bis(imino)pyridyl Iron Dichloride/Magnesium Dichloride] with AlR3 as an Activator Full article
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Journal of Polymer Science, Part A: Polymer Chemistry
ISSN: 0887-624X , E-ISSN: 1099-0518 |
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| Output data | Year: 2007, Volume: 45, Number: 22, Pages: 5057-5066 Pages count : 10 DOI: 10.1002/pola.22245 | ||
| Tags | Hydrogen activation, Iron (II) complex, Kinetics (polym.), MgCl2 supported catalysts, Molecular weight distribution/molar mass distribution, Polyethyle (PE) | ||
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Abstract:
The effects of polymerization temperature, polymerization time, ethylene and hydrogen concentration, and effect of comonomers (hexene-1, propylene) on the activity of supported catalyst of composition LFeCl2/MgCl2-Al(i-Bu)3 (L = 2,6-bis[1-(2,6-dimethylphenylimino)ethyl] pyridyl) and polymer characteristics (molecular weight (MW), molecular-weight distribution (MWD), molecular structure) have been studied. Effective activation energy of ethylene polymerization over LFeCl2/MgCl2-Al(i-Bu)3 has a value typical of supported Ziegler–Natta catalysts (11.9 kcal/mol). The polymerization reaction is of the first order with respect to monomer at the ethylene concentration >0.2 mol/L. Addition of small amounts of hydrogen (9–17%) significantly increases the activity; however, further increase in hydrogen concentration decreases the activity. The IRS and DSC analysis of PE indicates that catalyst LFeCl2/MgCl2-Al(i-Bu)3 has a very low copolymerizing ability toward propylene and hexene-1. MW and MWD of PE produced over these catalysts depend on the polymerization time, ethylene and hexene-1 concentration. The activation effect of hydrogen and other kinetic features of ethylene polymerization over supported catalysts based on the Fe (II) complexes are discussed.
Cite:
Mikenas T.B.
, Zakharov V.A.
, Echevskaya L.G.
, Matsko M.A.
Kinetic Features of Ethylene Polymerization over Supported Catalysts [2,6-Bis(imino)pyridyl Iron Dichloride/Magnesium Dichloride] with AlR3 as an Activator
Journal of Polymer Science, Part A: Polymer Chemistry. 2007. V.45. N22. P.5057-5066. DOI: 10.1002/pola.22245 WOS Scopus РИНЦ ANCAN OpenAlex
Kinetic Features of Ethylene Polymerization over Supported Catalysts [2,6-Bis(imino)pyridyl Iron Dichloride/Magnesium Dichloride] with AlR3 as an Activator
Journal of Polymer Science, Part A: Polymer Chemistry. 2007. V.45. N22. P.5057-5066. DOI: 10.1002/pola.22245 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Apr 13, 2007 |
| Accepted: | Jun 1, 2007 |
| Published online: | Oct 1, 2007 |
| Published print: | Nov 15, 2007 |
Identifiers:
| Web of science: | WOS:000250788600004 |
| Scopus: | 2-s2.0-35748943570 |
| Elibrary: | 13564785 |
| Chemical Abstracts: | 2007:1307492 |
| Chemical Abstracts (print): | 148:79361 |
| OpenAlex: | W2134028046 |