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Olefin polymerization behavior of titanium(IV) alkoxo complexes with fluorinated diolate ligands: The impact of the chelate ring size and the nature of organoaluminum compounds
Author(s) -
Tuskaev Vladislav A.,
Gagieva Svetlana Ch.,
Kurmaev Dmitry A.,
Melnikova Elizaveta K.,
Zubkevich Sergey V.,
Buzin Mikhail I.,
Nikiforova Galina G.,
Vasil'ev Viktor G.,
Saracheno Daniele,
Bogdanov Vyacheslav S.,
Privalov Viktor I.,
Bulychev Boris M.
Publication year - 2020
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.5933
Subject(s) - chemistry , polymer chemistry , polyethylene , polymerization , titanium , comonomer , polyolefin , trigonal bipyramidal molecular geometry , methylaluminoxane , ethylene , catalysis , crystallinity , polymer , organic chemistry , metallocene , crystal structure , crystallography , layer (electronics)
Titanium(IV) coordination compounds are effectively used as precatalysts for ethylene polymerization and copolymerization with other olefins. New titanium(IV) complexes 3b – d with ligands containing two diphenylcarbinol fragments linked by the perfluorinated hydrocarbon units –CF 2 – or –C 2 F 4 – were synthesized. The structures of complexes 3b and 3d were determined by X‐ray diffraction. Titanium atoms in 3b have a distorted trigonal‐bipyramidal coordination environment while spiro‐complex 3d is characterized by tetrahedral molecular geometry. The catalytic behavior of complexes activated by mixtures of Bu 2 Mg and alkylaluminium chlorides from among Me 2 AlCl, Et 2 AlCl, EtAlCl 2 , and Et 3 Al 2 Cl 3 were studied. The resulting catalytic systems catalyze ethylene polymerization to afford ultra‐high molecular weight polyethylene, suitable for modern processing methods, and the solvent‐free solid state formation of super high‐strength (1.37–2.75 GPa) and high‐modulus (up to 138 GPa) oriented film tapes. The same catalytic systems catalyze ethylene copolymerization with 1‐hexene to afford high molecular weight semicrystalline elastomeric polymers containing up to 20% of comonomer units.