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Open AccessArticle

Titanium and Vanadium Catalysts with 2-Hydroxyphenyloxazoline and Oxazine Ligands for Ethylene-Norbornene (co)Polymerization

1
Faculty of Chemistry, University of Opole, Oleska 48, 45-052 Opole, Poland
2
Department of Chemical Biology and Genetics, Centre of Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University, Olomouc, Holice CZ-78371, Czech Republic
3
Laboratory of Growth Regulators, Faculty of Science, Palacký University & Institute of Experimental Botany AS CR, Olomouc, Holice CZ-78371, Czech Republic
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(12), 1041; https://doi.org/10.3390/catal9121041
Received: 10 November 2019 / Revised: 6 December 2019 / Accepted: 6 December 2019 / Published: 8 December 2019
(This article belongs to the Section Catalysis in Organic and Polymer Chemistry)
A series of titanium and vanadium complexes with oxazoline 2-(4,5-dihydro-1,3-oxazol-2-yl)phenol (L1), 2-(4-methyl-4,5-dihydro-1,3-oxazol-2-yl)phenol (L2), and oxazine 2-(5,6-dihydro-4H-1,3-oxazin-2-yl)phenol (L3) ligands were synthesized, and their structures were determined by NMR and MS methods as (L)2MtCl2. The vanadium complexes were found to be highly active in ethylene (7300 kgPE/(molV·h)) and ethylene/norbornene (5300 kgCop/(molV·h)) (co)polymerization. The polyethylene characteristics were melting temperature (123–142 °C), crystallinity degree (49–75%), molecular weight (5.7–8.5 × 105 g/mol), molecular weight distribution (1.5–2.4). The ethylene-norbornene (E-NB) copolymer characteristics were molecular weight (2.6–0.9 × 105 g/mol), molecular weight distribution (1.6–2.2), glass transition temperature (4–62 °C), norbornene incorporation (12.3–30.1 mol%) at initial concentration (0.5–1.5 mol/L). The microstructure of E-NB copolymers depends on the catalyst applied with the highest diads content for the (L3)2VCl2 and triads for the (L2)2VCl2 complexes. View Full-Text
Keywords: polyethylene; norbornene copolymers; oxazole ligand; oxazine ligand; vanadium catalyst polyethylene; norbornene copolymers; oxazole ligand; oxazine ligand; vanadium catalyst
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MDPI and ACS Style

Ochędzan-Siodłak, W.; Siodłak, D.; Piontek, A.; Doležal, K. Titanium and Vanadium Catalysts with 2-Hydroxyphenyloxazoline and Oxazine Ligands for Ethylene-Norbornene (co)Polymerization. Catalysts 2019, 9, 1041.

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