Issue 7, 2020

Flexible cycloalkyl substituents in insertion polymerization with α-diimine nickel and palladium species

Abstract

The investigation of the relationship between the structure of the catalyst and the microstructure of the obtained polymer has attracted much attention and broad interest in the field of transition metal-catalyzed olefin polymerization. Cycloalkyls, especially cyclohexyl, are known for their rich conformational change. In this contribution, we described the synthesis and characterization of a series of bulky yet flexible cycloalkyl substituted α-diimine ligands and the corresponding nickel and palladium catalysts. The thermostable nickel complexes in this system show high activity (up to 4.89 × 106 g mol−1 h−1) and can generate highly branched polyethylene (up to 112/1000C) with a high molecular weight (up to 54.4 × 104 g mol−1). The obtained polyethylene displays good elastic properties (SR value up to 77%) characteristic of thermoplastic elastomers. The flexible cycloalkyl substituted palladium complexes exhibit low to moderate catalytic activities (0.6–43.9 × 106 g mol−1 h−1), low to moderate molecular weights (0.93–31.23 × 104 g mol−1), and high branching density (87–122/1000C) for ethylene polymerization, while allowing appreciable comonomer incorporation (1.0–7.7%) for ethylene/MA copolymerization. Most interestingly, compared to the flexible cyclohexyl substituted α-diimine nickel and palladium catalysts, the rigid phenyl substituted catalysts generated polyethylene with much lower branching density in ethylene polymerization.

Graphical abstract: Flexible cycloalkyl substituents in insertion polymerization with α-diimine nickel and palladium species

Supplementary files

Article information

Article type
Paper
Submitted
18 Dez 2019
Accepted
06 Jan 2020
First published
06 Jan 2020

Polym. Chem., 2020,11, 1393-1400

Flexible cycloalkyl substituents in insertion polymerization with α-diimine nickel and palladium species

S. Dai, S. Li, G. Xu, C. Wu, Y. Liao and L. Guo, Polym. Chem., 2020, 11, 1393 DOI: 10.1039/C9PY01901D

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