Abstract
Data on the ways of controlling the molecular structure of polyethylene (PE) synthesized over the supported catalysts containing Fe(II) bis(imino)pyridyl (LFeCl2) and Ni(II) bis(imine) (*LNiBr2) complexes immobilized on a silica gel modified with aluminum oxide (SiO2(Al)) are presented. Linear polyethylene with different molecular masses and a controllable molecular weight distribution (MWD) is synthesized by varying the conditions of polymerization on LFeCl2/SiO2(Al) catalysts. Ethylene homopolymerization over *LNiBr2/SiO2(Al) catalysts results in branched polyethylene with molecular mass and thermophysical characteristics close to that of low density polyethylene synthesized by ethylene copolymerization with α-olefins over supported metallocene and Ziegler type catalysts. A way for designing supported bicomponent catalysts containing LFeCl2 and *LNiBr2 complexes immobilized on an SiO2(Al) support for the targeted synthesis of polyethylene with a required molecular structure is proposed. Examples are given for the synthesis of linear polyethylene with a bimodal MWD on a bicomponent supported catalyst containing two different LFeCl2 complexes, the synthesis of polyethylene with a controllable distribution of branches on a bicomponent catalyst prepared via the immobilization of LFeCl2 and *LNiBr2 complexes on a SiO2(Al) support, and the modification of a chromium oxide catalyst with LFeCl2 complex for controlling the molecular mass and branch distributions in synthesized polyethylene are given.
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This work was performed as part of a State Task from the RF Ministry of Science and Higher Education for the Boreskov Institute of Catalysts, project no. AAAA-A21-121011490008-3.
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Mats’ko, M.A., Semikolenova, N.V. & Zakharov, V.A. New Ways of Controlling the Molecular Mass Characteristics and Distribution of Branches for Polyethylene Synthesized over Supported Catalysts Containing Fe(II) Bis(imino)pyridyl and Ni(II) Bis(imine) Complexes. Catal. Ind. 15, 267–277 (2023). https://doi.org/10.1134/S2070050423030066
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DOI: https://doi.org/10.1134/S2070050423030066