Abstract
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.
Highlights
Copolymers of ethylene with norbornene (E-NB) of interest for both science and industry
In a three-step procedure, methyl 2-hydroxybenzoate reacts with the appropriate amino alcohol to form intermediate hydroxybenzamide, which iswhich converted with SOCl2with to theSOCl hydrochloride, to the form the intermediate hydroxybenzamide, is converted
There is the characteristic peak at m/z 252, regardless of the titanium complex analyzed, which can be assigned to [(PhO)2 TiO] fragment resulting from loss of chloride atoms and oxazoline or oxazine fragment of ligands
Summary
Copolymers of ethylene with norbornene (E-NB) of interest for both science and industry. Do this is to use a designed catalyst that has a direct impact on the molecular structure of copolymer, The key factor determining tacticity and distribution of mers in the polymer chain is catalyst symmetry, which in turn affects its properties [1,6,7,10,11,12,13,14,15,16]. E-NB copolymers with high molecular weight, narrow molecular catalysts [21,22] are less studied, but they receive interest because it is possible to obtain the E-NB weight distribution, andmolecular high norbornene incorporation [13,15,16,17,18,23,24,25,26]. In contrast to the zirconium copolymers with high weight, narrow molecular weight distribution, and high norbornene andincorporation titanium catalysts, which work best after methylaluminoxane (MAO).
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