Issue 45, 2020

8-Arylnaphthyl substituent retarding chain transfer in insertion polymerization with unsymmetrical α-diimine systems

Abstract

Late transition metal olefin polymerization catalysts based on the imine structure are usually constructed with bulky arylamines as the basic unit. In this contribution, a flexible compact alkyl amine and a series of rigid bulky anilines were introduced into the α-diimine catalytic system at the same time. Thus, a series of unsymmetrical α-diimine ligands bearing an n-butyl moiety and diarylmethyl or 8-arylnaphthyl moiety as well as the corresponding nickel and palladium complexes were designed, synthesized and characterized. These unsymmetrical α-diimine nickel and palladium complexes were investigated for ethylene polymerization and copolymerization with methyl acrylate (MA). Under the synergistic effect of compact alkyl substituents and bulky aryl substituents, the nickel complexes showed moderate to high activities and generated low to high molecular weight polyethylene with various branching densities. Similar polymerization results were also observed in the corresponding palladium system. The aryl orientation in rigid bulky aryl substituents has significant effects on the polymerizations and copolymerizations in terms of activity, the molecular weight of the obtained polyethylene and copolymer, and the incorporation ratio of MA.

Graphical abstract: 8-Arylnaphthyl substituent retarding chain transfer in insertion polymerization with unsymmetrical α-diimine systems

Supplementary files

Article information

Article type
Paper
Submitted
30 Aug 2020
Accepted
21 Oct 2020
First published
21 Oct 2020

Polym. Chem., 2020,11, 7199-7206

8-Arylnaphthyl substituent retarding chain transfer in insertion polymerization with unsymmetrical α-diimine systems

S. Li and S. Dai, Polym. Chem., 2020, 11, 7199 DOI: 10.1039/D0PY01231A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements