Origin of “Multisite-like” Ethylene Polymerization Behavior of the Single-Site Nonsymmetrical Bis(imino)pyridine Iron(II) Complex in the Presence of Modified Methylaluminoxane | Sciact - CRIS-система Института катализа

Origin of “Multisite-like” Ethylene Polymerization Behavior of the Single-Site Nonsymmetrical Bis(imino)pyridine Iron(II) Complex in the Presence of Modified Methylaluminoxane Научная публикация

Журнал

ACS Catalysis
ISSN: 2155-5435

Вых. Данные

Год: 2017, Том: 7, Номер: 4, Страницы: 2868-2877 Страниц : 10 DOI: 10.1021/acscatal.7b00486

Ключевые слова

Bis(imino)pyridine, Chain transfer, Ethylene polymerization, MMAO, Molecular-weight distribution, Multisite catalysts

Авторы

Semikolenova Nina V. ¹ , Sun Wen-Hua ² , Soshnikov Igor E. ^1,3 , Matsko Mikhail A. ¹ , Kolesova Olga V. ^1,3 , Zakharov Vladimir A. ^1,3 , Bryliakov Konstantin P. ^1,3

Организации

1	Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
2	Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
3	Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation

Информация о финансировании (2)

1	Российский фонд фундаментальных исследований	16-53-53014
2	Федеральное агентство научных организаций России	0303-2016-0009

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.

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 CAPlusCA OpenAlex

Поступила в редакцию:	13 февр. 2017 г.
Принята к публикации:	16 мар. 2017 г.
Опубликована online:	24 мар. 2017 г.
Опубликована в печати:	7 апр. 2017 г.

Web of science:	WOS:000398986700074
Scopus:	2-s2.0-85019085389
РИНЦ:	31023636
Chemical Abstracts:	2017:440699
Chemical Abstracts (print):	166:339763
OpenAlex:	W2595896188

БД	Цитирований
Web of science	72
Scopus	73
РИНЦ	68
OpenAlex	72