Origin of “Multisite-like” Ethylene Polymerization Behavior of the Single-Site Nonsymmetrical Bis(imino)pyridine Iron(II) Complex in the Presence of Modified Methylaluminoxane Full article
| Journal |
ACS Catalysis
ISSN: 2155-5435 |
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| Output data | Year: 2017, Volume: 7, Number: 4, Pages: 2868-2877 Pages count : 10 DOI: 10.1021/acscatal.7b00486 | ||||||
| Tags | Bis(imino)pyridine, Chain transfer, Ethylene polymerization, MMAO, Molecular-weight distribution, Multisite catalysts | ||||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Russian Foundation for Basic Research | 16-53-53014 |
| 2 | Federal Agency for Scientific Organizations | 0303-2016-0009 |
Abstract:
A detailed study of the effect of reaction temperature, time, and cocatalyst composition on the ethylene polymerization performance of 2-[1-(2,6-dibenzhydryl-4-chlorophenylimino)ethyl]-6-(1-mesityliminoethyl)pyridyliron dichloride (1) is reported. In the presence of modified methylaluminoxane (MMAO), 1 behaves like a highly active, “multisite-like” ethylene polymerization catalyst, with the resulting polyethylenes having time-dependent bimodal-like molecular-weight distributions and featuring saturated (n-propyl- and i-butyl-terminated) chain ends. To readily distinguish between bimodal and bimodal-like molecular-weight distributions, we have proposed the use of the dNf/(d log M) – log M representation further to the mainstream dWf/(d log M) – log M one. The consensus mechanism of chain transfer and chain-end formation in the presence of MMAO has been proposed, which explains the composition and amount of terminal alkyl groups in the polymer, and the apparent “multisite-like” nature of the iron catalyst. A comparison between the catalytic behaviors of the “multisite-like” 1/MMAO catalyst system and the truly multisite catalyst system based on Brookhart’s symmetrical bis(imino)pyridine iron catalyst 2 is given.
Cite:
Semikolenova N.V.
, Sun W-H.
, Soshnikov I.E.
, Matsko M.A.
, Kolesova O.V.
, Zakharov V.A.
, Bryliakov K.P.
Origin of “Multisite-like” Ethylene Polymerization Behavior of the Single-Site Nonsymmetrical Bis(imino)pyridine Iron(II) Complex in the Presence of Modified Methylaluminoxane
ACS Catalysis. 2017. V.7. N4. P.2868-2877. DOI: 10.1021/acscatal.7b00486 WOS Scopus РИНЦ ANCAN OpenAlex
Origin of “Multisite-like” Ethylene Polymerization Behavior of the Single-Site Nonsymmetrical Bis(imino)pyridine Iron(II) Complex in the Presence of Modified Methylaluminoxane
ACS Catalysis. 2017. V.7. N4. P.2868-2877. DOI: 10.1021/acscatal.7b00486 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Feb 13, 2017 |
| Accepted: | Mar 16, 2017 |
| Published online: | Mar 24, 2017 |
| Published print: | Apr 7, 2017 |
Identifiers:
| Web of science: | WOS:000398986700074 |
| Scopus: | 2-s2.0-85019085389 |
| Elibrary: | 31023636 |
| Chemical Abstracts: | 2017:440699 |
| Chemical Abstracts (print): | 166:339763 |
| OpenAlex: | W2595896188 |