Novel titanium(IV) diolate complexes with additional O-donor as precatalyst for the synthesis of ultrahigh molecular weight polyethylene with reduced entanglement density: Influence of polymerization conditions and its implications on mechanical properties

New alkoxo-titanium(IV) complexes with diolate ligand containing additional donor oxygen atom have been synthesized from readily available and scalable precursors. The structure of complex 4 was established by X-ray diffraction. Titanium atom adopts a distorted tetrahedral geometry formed by six oxygen atoms of ligands. The resulting complexes 3–4 are moderately or highly active in ethylene polymerization in the presence of {EtnAlCl3–n + Bu2Mg} binary cocatalysts. The influence of the nature of the solvent, the organoaluminum cocatalyst and the polymerization temperature on the activity of catalytic systems, and the properties of the resulting polymers were studied. The obtained polymers are linear polyethylene of ultrahigh molecular weight (up to 5.8·106 g mol−1) with a broad molecular weight distribution. The polymers are suitable for the modern methods of polymer processing—the solventless solid-state formation of super high-strength (breaking strength up to 2.8 GPa) and high-modulus (elastic modulus up to 140 GPa) oriented films and film tapes. The possibility of scaling up the synthesis of ultrahigh molecular weight polyethylene (UHMWPE) without a significant drop in the productivity of the catalytic system and polymer properties is shown. UHMWPE samples have been investigated by small-angle X-ray scattering (SAXS) methods to study the structural changes induced by solid-state drawing of nascent reactor powders. © 2021 John Wiley & Sons, Ltd.

Tuskaev V.A.1, 2 , Gagieva S.C.1, 2 , Kurmaev D.A.1 , Bogdanov V.S.2 , Magomedov K.F.1 , Mikhaylik E.S. 2, 3 , Golubev E.K. 2, 3 , Buzin M.I.2 , Nikiforova G.G.2 , Vasil'ev V.G. 2 , Khrustalev V.N. 3, 4 , Dorovatovskii P.V. 5, 6 , Bakirov A.V.6, 7 , Shcherbina M. 3, 6 , Dzhevakov P.B. 1 , Bulychev B.M.1
John Wiley and Sons Ltd
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  • 1 Department of Chemistry, M. V. Lomonosov Moscow State University, Moscow, Russian Federation
  • 2 A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russian Federation
  • 3 Department of Inorganic Chemistry, Peoples' Friendship University of Russia (RUDN University), Moscow, Russian Federation
  • 4 Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
  • 5 Department of Synchrotron Experimental Stations, National Research Center “Kurchatov Institute”, Moscow, Russian Federation
  • 6 Laboratory of functional polymer structures, Enikolopov Institute of Synthetic Polymer Materials Russian Academy of Sciences, Moscow, Russian Federation
  • 7 Department of Chemistry, Moscow Institute of Physics and Technology, Dolgoprudny, Moscow, Russian Federation
catalysts; titanium(IV) complexes; ultrahigh molecular weight polyethylene; Ziegler–Natta polymerization
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