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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
Author(s) -
Tuskaev Vladislav A.,
Gagieva Svetlana Ch.,
Kurmaev Dmitrii A.,
Bogdanov Vyacheslav S.,
Magomedov Kasim F.,
Mikhaylik Elena S.,
Golubev Evgenii K.,
Buzin Mikhail I.,
Nikiforova Galina G.,
Vasil'ev Viktor G.,
Khrustalev Viktor N.,
Dorovatovskii Pavel V.,
Bakirov Artem V.,
Shcherbina Maksim А.,
Dzhevakov Pavel B.,
Bulychev Boris M.
Publication year - 2021
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.6256
Subject(s) - polyethylene , polymer , polymerization , chemistry , titanium , polymer chemistry , coordination polymerization , molar mass distribution , chemical engineering , anionic addition polymerization , organic chemistry , engineering
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 {Et n AlCl 3– n + Bu 2 Mg} 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 5.8·10 6 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.