Abstract
The seminal report of α-diimine palladium and nickel catalysts in 1995 represented a major breakthrough in the preparation of functionalized polyolefin materials. Owing to the high abundance and low cost of nickel, nickel-based catalysts have great application prospects in the industrialization process of olefin coordination polymerization. In this work, various <i>N</i>-aryl substituents with different electronic effects were synthesized and introduced into α-diimine ligands. The as-prepared α-diimine nickel catalysts showed high polymerization activity (0.9×10<sup>7</sup>–3.0×10<sup>7</sup> g·mol<sup>−1</sup>·h<sup>−1</sup>) in ethylene polymerization, generating polyethylene products with adjustable molecular weights (<i>M</i><sub>n</sub> values: 7.4×10<sup>4</sup>–146.9×10<sup>4</sup> g·mol<sup>−1</sup>) and branching densities (31/1000 C–68/1000 C). The resulting polyethylene products showed excellent mechanical properties, with high tensile strength (up to 25.0 MPa) and high strain at break values (up to <styled-content style-type="number">3890</styled-content>%). The copolymerization of ethylene and polar monomers can also be achieved by these nicekel complexes, ultimately preparing functionalized polyolefins.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call