Copolymerization of Ethylene with 1-hexene over Highly Active Supported Ziegler–Natta Catalysts with Vanadium Active Component but Different Vanadium Contents | Sciact - CRIS-system of Boreskov Institute of Catalysis

Copolymerization of Ethylene with 1-hexene over Highly Active Supported Ziegler–Natta Catalysts with Vanadium Active Component but Different Vanadium Contents Full article

Journal

Iranian Polymer Journal
ISSN: 1026-1265 , E-ISSN: 1735-5265

Output data

Year: 2024, DOI: 10.1007/s13726-024-01401-x

Tags

Ziegler–Natta catalysts; Vanadium–magnesium catalysts; Ethylene–1-hexene copolymerization; Copolymer heterogeneity; Molecular weight distribution

Authors

Zhao Zenghui ¹ , Mikenas Tatiana B. ² , Guan Peng ³ , Matsko Mikhail A. ² , Zakharov Vladimir A. ² , Wu Wei ⁴

Affiliations

1	China National Petroleum Corporation, Daqing Chemical Research Institute, Daqing, China
2	Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospect Akademika Lavrentieva, 5, Novosibirsk, 630090, Russia
3	Novosibirsk State University, St. Pirogova 2, Novosibirsk, 630090, Russia
4	Heilongjiang University, Harbin, China

Funding (1)

Ministry of Science and Higher Education of the Russian Federation

FWUR-2024-0037

The kinetics of copolymerization of ethylene with 1-hexene over highly active V-Mg Ziegler–Natta catalysts [VMC: VCl4/MgCl2 + Al (i-Bu)3] at different contents of vanadium (4 and 0.1 wt% of V) was studied. Data on copolymerization ability of these catalysts, molecular weight characteristics, and compositional homogeneity of the produced copolymers were attained. It was found that the introduction of 1-hexene led to broadening of the molecular weight distribution of copolymer (an increase in the Mw/Mn value) relative to homopolyethylene due to a decrease in the molecular weight (Mn) in the region of 1–100 kg mol−1 without changes in the molecular weight in the region of Mn > 500 kg mol−1 for two used VMCs catalysts. This result testified to non-uniformity of the active centers of these catalysts in the chain transfer reaction with participation of 1-hexene. Therefore, the active centers of VMCs producing high-molecular polyethylene were virtually not involved in the chain transfer reaction with 1-hexene. At the same time, these centers were more reactive in the incorporation of 1-hexene. This led to unusual distribution of butyl branches in ethylene–1-hexene copolymers produced over VMCs, namely, to an increased content of butyl branches in the high-molecular fraction of copolymers (Mw > 1000 kg mol−1).

Zhao Z. , Mikenas T.B. , Guan P. , Matsko M.A. , Zakharov V.A. , Wu W.
Copolymerization of Ethylene with 1-hexene over Highly Active Supported Ziegler–Natta Catalysts with Vanadium Active Component but Different Vanadium Contents
Iranian Polymer Journal. 2024. DOI: 10.1007/s13726-024-01401-x WOS Scopus OpenAlex

Submitted:	May 15, 2024
Accepted:	Sep 1, 2024
Published online:	Nov 26, 2024

Web of science:	WOS:001364363500001
Scopus:	2-s2.0-85210394339
OpenAlex:	W4404743071

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