Achieving strictly linear polyethylenes by the NNN-Fe precatalysts finely tuned with different sizes of ortho-cycloalkyl substituents

Achieving strictly linear polyethylenes by the NNN-Fe precatalysts finely tuned with different sizes of ortho-cycloalkyl substituents Full article

Journal

Applied Organometallic Chemistry
ISSN: 0268-2605

Output data

Year: 2020, Volume: 34, Number: 11, Article number : e5937, Pages count : DOI: 10.1002/aoc.5937

Tags

correlation between structure activity and product; ethylene polymerization; highly linear polyethylene; N,N,N-Fe precatalysts; α,α’-bis (aryl)-2,3:5,6-bis (pentamethylene)pyridine

Authors

Suo Hongyi ^1,2 , Li Zilong ^1,2 , Oleynik Irina V. ³ , Wang Zheng ¹ , Oleynik Ivan I. ³ , Ma Yanping ¹ , Liu Qingbin ⁴ , Sun Wen -H. ^1,2

Affiliations

1	(Scopus) Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
2	(Scopus) CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
3	(Scopus) N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Pr. Lavrentjeva 9, Novosibirsk, 630090, Russian Federation
4	(Scopus) College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, 050024, China

Six examples of newly synthesized α,α’-bis (aryl)-2,3:5,6-bis (pentame thylene)pyridyliron complexes [2,3:5,6-{C4H8C(NAr)}2C5HN]FeCl2 (Ar = 2-(c-C5H9)-6-MeC6H3 Fe1, 2-(c-C6H11)-6-MeC6H3 Fe2, 2-(c-C8H15)-6-MeC6H3 Fe3, 2-(c-C5H9)-4,6-Me2C6H2 Fe4, 2-(c-C6H11)-4,6-Me2C6H2 Fe5, 2-(c-C8H15)-4,6-Me2C6H2 Fe6; c refers as cyclic), on activation with methylalumoxane (MAO) or modified MAO (MMAO), exhibit high activities towards ethylene polymerization, producing strictly linear polyethylenes with terminal vinyl groups. The catalytic performances are systematically investigated along with various polymerization parameters as well as the microstructures of resultant polyethylenes. The steric hindrances of ortho-cycloalkyl substituents of Nimino-aryl groups significantly affect the activities of the corresponding iron precatalysts as well as the microstructures of resultant polyethylenes: higher steric hindrance the ortho-cycloalkyl substituents, higher activity the iron precatalyst, lower molecular weight the resultant polyethylenes. Experimental observations are additionally supported by the computational study. The resultant polyethylenes exhibited excellent hydrophobicity. © 2020 John Wiley & Sons, Ltd.

Suo H. , Li Z. , Oleynik I.V. , Wang Z. , Oleynik I.I. , Ma Y. , Liu Q. , Sun W.-H.
Achieving strictly linear polyethylenes by the NNN-Fe precatalysts finely tuned with different sizes of ortho-cycloalkyl substituents
Applied Organometallic Chemistry. 2020. V.34. N11. e5937 . DOI: 10.1002/aoc.5937 WOS Scopus РИНЦ

Published online:	Jul 13, 2020
Published print:	Nov 1, 2020

Web of science	WOS:000577136800044
Scopus	2-s2.0-85087749600
Elibrary	45482409
OpenAlex	W3042603081