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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Related Institution
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National Engineering Research Center of Novel Equipment for Polymer Processing; Key Laboratory of Polymer Processing Engineering, Ministry of Education; Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing; School of Mechanical and Automotive Engineering, South China University of Technology
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)