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Issue 71, 2019
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The influences of electronic effect and isomerization of salalen titanium(iv) complexes on ethylene polymerization in the presence of methylaluminoxane

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Abstract

Herein, two salalen titanium(IV) complexes were synthesized and characterized. These complexes coexisted as two isomers in certain conditions and underwent isomerization, as evidenced by 1H NMR spectroscopy. Furthermore, the molar ratio of the two isomers ranged from 100 : 15 at 30 °C to 100 : 34 at 120 °C, driven by thermal energy, based on variable temperature 1H NMR characterization. Both complexes were employed as catalysts for ethylene polymerization in the presence of methylaluminoxane (MAO). The influence of the electronic effects of different substituent groups at the ortho position of the phenolate on ethylene polymerization behaviors, molecular weight and molecular weight distributions of the resulting polyethylene was investigated. The fluorinated salalen titanium(IV) complex revealed relatively high catalytic activity and thermal stability owing to the electron-withdrawing inductive effect. Moreover, disentangled linear polyethylene with ultrahigh molecular weight (Mw up to 3000 kDa) and narrow molecular weight distribution (Mw/Mn ∼ 2) was obtained in the polymerization temperature range of 30 °C to 50 °C.

Graphical abstract: The influences of electronic effect and isomerization of salalen titanium(iv) complexes on ethylene polymerization in the presence of methylaluminoxane

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Article information


Submitted
29 Oct 2019
Accepted
05 Dec 2019
First published
17 Dec 2019

This article is Open Access

RSC Adv., 2019,9, 41824-41831
Article type
Paper

The influences of electronic effect and isomerization of salalen titanium(IV) complexes on ethylene polymerization in the presence of methylaluminoxane

S. Li, Y. Zhu, H. Liang, X. Xie, Y. Zhan, G. Liang and F. Zhu, RSC Adv., 2019, 9, 41824
DOI: 10.1039/C9RA08899G

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