Tuning 2,3-Bis(arylimino)butane-nickel Precatalysts for High-Molecular-Weight Polyethylene Elastomers DOI Creative Commons

Dongzhi Zhu,

Dedong Jia, Qiuyue Zhang

et al.

Molecules, Journal Year: 2025, Volume and Issue: 30(8), P. 1847 - 1847

Published: April 20, 2025

The catalytic performance of α-diiminonickel complexes is highly sensitive to structural modifications in their ligand frameworks. In this study, a series unsymmetrical 2,3-bis(arylimino)butane-nickel featuring ortho-2,6-dibenzhydryl groups as sterically demanding motifs and para-methyl electron-donating enhancers were proposed synthesized. These nickel thoroughly characterized using FTIR, elemental analysis, single-crystal X-ray diffraction (for Ni4 Ni5), revealing deviations from ideal tetrahedral geometry. Upon activation with Et2AlCl, these demonstrated exceptional ethylene polymerization activity, achieving remarkable value 13.67 × 106 g PE mol-1 (Ni) h-1 at 20 °C. Notably, even 80 °C, the maintained high activity 1.97 h-1, showcasing superiority compared previously reported complexes. resulting polyethylenes exhibited ultra-high molecular weights (Mw: 3.33-19.47 105 mol-1) tunable branching densities (84-217/1000C), which effectively controlled by temperature. Moreover, mechanical properties polyethylenes, including tensile strength (σb = 0.74-16.83 MPa), elongation break (εb 271-475%), elastic recovery (SR 42-74%), finely tailored optimizing weight, crystallinity, degree. prepared displayed outstanding recovery, hallmark high-performance thermoplastic elastomers, making them promising candidates for advanced material applications.

Language: Английский

Fluoro-enriched α-diimine nickel precatalysts for enhanced thermostability in synthesis of polyethylene elastomer DOI
Geng Ren, Qaiser Mahmood, Shuangshuang Liu

et al.

European Polymer Journal, Journal Year: 2025, Volume and Issue: unknown, P. 114004 - 114004

Published: May 1, 2025

Language: Английский

Citations

0
Synergistic effects of methoxy and Benzhydryl substituents in α-Diimine nickel catalysts for Homo- and copolymerization of 1-Hexene and norbornene DOI
Chantsalnyam Bariashir,

Yujin Seong,

Seul Lee

et al.

European Polymer Journal, Journal Year: 2025, Volume and Issue: unknown, P. 113908 - 113908

Published: April 1, 2025

Language: Английский

Citations

0
Tuning 2,3-Bis(arylimino)butane-nickel Precatalysts for High-Molecular-Weight Polyethylene Elastomers DOI Creative Commons

Dongzhi Zhu,

Dedong Jia, Qiuyue Zhang

et al.

Molecules, Journal Year: 2025, Volume and Issue: 30(8), P. 1847 - 1847

Published: April 20, 2025

The catalytic performance of α-diiminonickel complexes is highly sensitive to structural modifications in their ligand frameworks. In this study, a series unsymmetrical 2,3-bis(arylimino)butane-nickel featuring ortho-2,6-dibenzhydryl groups as sterically demanding motifs and para-methyl electron-donating enhancers were proposed synthesized. These nickel thoroughly characterized using FTIR, elemental analysis, single-crystal X-ray diffraction (for Ni4 Ni5), revealing deviations from ideal tetrahedral geometry. Upon activation with Et2AlCl, these demonstrated exceptional ethylene polymerization activity, achieving remarkable value 13.67 × 106 g PE mol-1 (Ni) h-1 at 20 °C. Notably, even 80 °C, the maintained high activity 1.97 h-1, showcasing superiority compared previously reported complexes. resulting polyethylenes exhibited ultra-high molecular weights (Mw: 3.33-19.47 105 mol-1) tunable branching densities (84-217/1000C), which effectively controlled by temperature. Moreover, mechanical properties polyethylenes, including tensile strength (σb = 0.74-16.83 MPa), elongation break (εb 271-475%), elastic recovery (SR 42-74%), finely tailored optimizing weight, crystallinity, degree. prepared displayed outstanding recovery, hallmark high-performance thermoplastic elastomers, making them promising candidates for advanced material applications.

Language: Английский

Citations

0