Olefin Polymerization Behavior of Titanium(IV) Complexes with Fluorinated and Non-fluorinated Aliphatic Phenoxyimine Ligands
RESEARCH ARTICLE|Updated:2023-12-26
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Olefin Polymerization Behavior of Titanium(IV) Complexes with Fluorinated and Non-fluorinated Aliphatic Phenoxyimine Ligands
Olefin Polymerization Behavior of Titanium(IV) Complexes with Fluorinated and Non-fluorinated Aliphatic Phenoxyimine Ligands
高分子科学(英文版)2024年42卷第1期 页码:52-62
Affiliations:
a.Department of Chemistry, M. V. Lomonosov Moscow State University, Moscow 119992, Russian Federation
b.A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow 119991, Russian Federation
c.Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, Moscow 117393, Russian Federation
Author bio:
tuskaev@yandex.ru
Funds:
Synthesis of Ti(IV) phenoxy-imine complexes, study of the ethylene polymerization process and properties of the resulting UHMWPE samples, synthesis of ethylene copolymers and study of their properties were supported by the Russian Science Foundation (No. 22-23-00578). X-ray diffraction data were collected with the financial support from the Ministry of Science and Higher Education of the Russian Federation using the equipment of Center for molecular composition studies of INEOS RAS (No. 075-00697-22-00). NMR studies, DSC, elemental analysis were performed with the financial support of the Ministry of Science and Higher Education of the Russian Federation employing the equipment of Center for molecular composition studies of INEOS RAS.;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-023-3032-1.
Tuskaev, V. A.; Magomedov, K. F.; Gagieva, S. Ch.; Kurmaev, D. A.; Nelyubina, Y. V.; Golubev, E. K.; Evseeva, M. D.; Vasil’ev, V. G.; Nikiforova, G. G.; Buzin, M. I.; Bogdanov, V. S.; Bulychev, B. M. Olefin polymerization behavior of titanium(IV) complexes with fluorinated and non-fluorinated aliphatic phenoxyimine ligands. Chinese J. Polym. Sci. 2024, 42, 52–62
Vladislav A. Tuskaev, Kasim F. Magomedov, Svetlana Ch. Gagieva, et al. Olefin Polymerization Behavior of Titanium(IV) Complexes with Fluorinated and Non-fluorinated Aliphatic Phenoxyimine Ligands[J]. Chinese Journal of Polymer Science, 2024, 42(1): 52-62.
Tuskaev, V. A.; Magomedov, K. F.; Gagieva, S. Ch.; Kurmaev, D. A.; Nelyubina, Y. V.; Golubev, E. K.; Evseeva, M. D.; Vasil’ev, V. G.; Nikiforova, G. G.; Buzin, M. I.; Bogdanov, V. S.; Bulychev, B. M. Olefin polymerization behavior of titanium(IV) complexes with fluorinated and non-fluorinated aliphatic phenoxyimine ligands. Chinese J. Polym. Sci. 2024, 42, 52–62DOI: 10.1007/s10118-023-3032-1.
Vladislav A. Tuskaev, Kasim F. Magomedov, Svetlana Ch. Gagieva, et al. Olefin Polymerization Behavior of Titanium(IV) Complexes with Fluorinated and Non-fluorinated Aliphatic Phenoxyimine Ligands[J]. Chinese Journal of Polymer Science, 2024, 42(1): 52-62.DOI: 10.1007/s10118-023-3032-1.
Olefin Polymerization Behavior of Titanium(IV) Complexes with Fluorinated and Non-fluorinated Aliphatic Phenoxyimine Ligands
The synthesized Ti(IV) complexes with aliphatic phenoxyimine ligands in the presence of Al/Mg activators initiate the synthesis of disentangled UHMWPE with high productivity. The polymer is suitable for solventless processing into oriented high-strength films. In ethylene/octene-1 copolymerization
fluorine-containing systems provide greater activity and higher comonomer content.
Abstract
A series of Ti(IV) dichloride and dialkoxide complexes with phenoxyimine ligands containing fluorinated and nonfluorinated aliphatic imine fragments have been synthesized. The molecular structures of complexes
1
and
4
were established by single-crystal X-ray diffraction studies. The complexes adopt a distorted octahedral coordination structure around the titanium atom and two oxygen atoms are situated in
trans
position while two nitrogen atoms and two outgoing ligands (Cl or
i
PrO) are situated in
cis
position. Effect of activators (MMAO-12 and combinations Et
n
AlCl
3−
n
+ Bu
2
Mg) and outgoing ligand (Cl or
i
PrO) nature on the catalytic activity and properties of the resulting polymers was studied. The Ti complexes
despite the nature of the outgoing ligands (Cl or
i
PrO) in the presence of Al/Mg activators
was found to display a high ethylene polymerization activity in the range 1600−3830 kg
polymer
·mol
Ti
−1
·h
−1
·atm
−1
with a viscosity average molecular weight (
M
v
) value in the range 1.1×10
6
−7.1×10
6
Dalton (Da). The resulting UHMWPE can be processed by a solventless method into high-strength and high-modulus oriented films. The rheological characteristics of a polymer melt have been studied. The absence of a cross-over point did not allow to compare the values of the molecular weight distribution of polymers obtained on fluorinated and non-fluorinated pre-catalysts
however
the estimation of the entanglement density is in good agreement with the mechanical characteristics of oriented films. Upon activation with methylalumoxane
the activity of the complexes decreased very significantly; however
a polymer with a molecular weight of about 12 million Da was obtained. In the process of ethylene/octene-1 copolymerization
fluorine-containing precatalysts showed a clear advantage over non-fluorinated analogues both in activity and in comonomer content.
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相关机构
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Key Laboratory of Materials Chemistry for Energy Conversion and Storage (HUST) of Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST)