Sciact
  • EN
  • RU

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: 2025, Volume: 34, Pages: 625–635 Pages count : 11 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)

1 Ministry of Science and Higher Education of the Russian Federation FWUR-2024-0037

Abstract: 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).
Cite: 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. 2025. V.34. P.625–635. DOI: 10.1007/s13726-024-01401-x WOS Scopus OpenAlex
Dates:
Submitted: May 15, 2024
Accepted: Sep 1, 2024
Published online: Nov 26, 2024
Published print: May 1, 2025
Identifiers:
Web of science: WOS:001364363500001
Scopus: 2-s2.0-105002995352
OpenAlex: W4404743071
Citing: Пока нет цитирований
Altmetrics: