Regulation of Molecular Weight, Molecular Weight Distribution and Branching Distribution in Polyethylene, Produced by Supported Catalysts Bearing bis(imino)pyridyl Fe(II) and N,N-α-diimine Ni(II) Complexes Full article
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Polyolefins Journal
ISSN: 2322-2212 , E-ISSN: 2345-6868 |
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| Output data | Year: 2022, Volume: 9, Number: 2, Pages: 103-116 Pages count : 14 DOI: 10.22063/POJ.2022.3072.1208 | ||
| Tags | Ethylene polymerization; supported catalysts; bis(imino)pyridyl complex of Fe; diimine complex of Ni; molecular weight distribution | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0004 |
Abstract:
For preparation of highly active supported catalyst with bis(imino)pyridyl Fe(II) complexes (Fe1, Fe2) and N,N-α-diimine complex of Ni (Ni3), silica modified with alumina (SiO2 (Al)) was used as a support. Data on the possibility to regulate molecular weight (MW) and molecular weight distribution (MWD) of polyethylene (PE), produced over the supported catalyst Fe1/SiO2 (Al)+TIBA by variation of polymerization temperature and the addition of hydrogen and hexene-1, are obtained. The prepared PE samples were characterized by Mw values varied from 80 to 350 kg/mol and various MMD (Mw/Mn=4.6-11.7).
By grafting on SiO2(Al) of two different iron bis(imino)pyridyl complexes, producing PE with diverse MW, bi-component catalyst was prepared. This catalyst generates linear PE with broad and bimodal MWD (Mw/Mn=33).
Fixation on SiO2(Al) of α-diimine Ni(II) pre-catalyst (Ni3), yielding high molecular weight branched PE at the ethylene homopolymerization, and bis(imino)pyridyl Fe(II) complex (Fe2) that forms lower molecular weight linear PE, affords formation of a new bi-component catalyst. The catalyst produces PE with broad MWD and high content of branches concentrated in high molecular weight PE fraction.
Cite:
Semikolenova N.V.
, Panchenko V.N.
, Matsko M.A.
, Zakharov V.A.
Regulation of Molecular Weight, Molecular Weight Distribution and Branching Distribution in Polyethylene, Produced by Supported Catalysts Bearing bis(imino)pyridyl Fe(II) and N,N-α-diimine Ni(II) Complexes
Polyolefins Journal. 2022. V.9. N2. P.103-116. DOI: 10.22063/POJ.2022.3072.1208 Scopus РИНЦ AN OpenAlex
Regulation of Molecular Weight, Molecular Weight Distribution and Branching Distribution in Polyethylene, Produced by Supported Catalysts Bearing bis(imino)pyridyl Fe(II) and N,N-α-diimine Ni(II) Complexes
Polyolefins Journal. 2022. V.9. N2. P.103-116. DOI: 10.22063/POJ.2022.3072.1208 Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Dec 23, 2021 |
| Accepted: | Feb 19, 2022 |
| Published online: | Feb 20, 2022 |
| Published print: | Jul 1, 2022 |
Identifiers:
| Scopus: | 2-s2.0-85133726444 |
| Elibrary: | 50312555 |
| Chemical Abstracts: | 2022:2040403 |
| OpenAlex: | W4390180955 |