Tuning 2,3-Bis(arylimino)butane-nickel Precatalysts for High-Molecular-Weight Polyethylene Elastomers Article Swipe
Dongzhi Zhu
,
Dedong Jia
,
Qiuyue Zhang
,
Yanping Ma
,
Qaiser Mahmood
,
Wen‐Hua Sun
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3390/molecules30081847
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3390/molecules30081847
The catalytic performance of α-diiminonickel complexes is highly sensitive to structural modifications in their ligand frameworks. In this study, a series of unsymmetrical 2,3-bis(arylimino)butane-nickel complexes featuring ortho-2,6-dibenzhydryl groups as sterically demanding motifs and para-methyl groups as electron-donating enhancers were proposed and synthesized. These nickel complexes were thoroughly characterized using FTIR, elemental analysis, and single-crystal X-ray diffraction (for Ni4 and Ni5), revealing deviations from ideal tetrahedral geometry. Upon activation with Et2AlCl, these complexes demonstrated exceptional ethylene polymerization activity, achieving a remarkable value of 13.67 × 106 g PE mol−1 (Ni) h−1 at 20 °C. Notably, even at 80 °C, the nickel complexes maintained a high activity of 1.97 × 106 g PE mol−1 (Ni) h−1, showcasing superiority compared to previously reported unsymmetrical 2,3-bis(arylimino)butane-nickel complexes. The resulting polyethylenes exhibited ultra-high molecular weights (Mw: 3.33–19.47 × 105 g mol−1) and tunable branching densities (84–217/1000C), which were effectively controlled by polymerization temperature. Moreover, the mechanical properties of the polyethylenes, including tensile strength (σb = 0.74–16.83 MPa), elongation at break (εb = 271–475%), and elastic recovery (SR = 42–74%), were finely tailored by optimizing molecular weight, crystallinity, and branching degree. The prepared polyethylenes displayed outstanding elastic recovery, a hallmark of high-performance thermoplastic elastomers, making them promising candidates for advanced material applications.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3390/molecules30081847
- https://www.mdpi.com/1420-3049/30/8/1847/pdf?version=1745133737
- OA Status
- gold
- Cited By
- 2
- References
- 62
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4409605910
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- OpenAlex ID
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https://openalex.org/W4409605910Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.3390/molecules30081847Digital Object Identifier
- Title
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Tuning 2,3-Bis(arylimino)butane-nickel Precatalysts for High-Molecular-Weight Polyethylene ElastomersWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2025Year of publication
- Publication date
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2025-04-20Full publication date if available
- Authors
-
Dongzhi Zhu, Dedong Jia, Qiuyue Zhang, Yanping Ma, Qaiser Mahmood, Wen‐Hua SunList of authors in order
- Landing page
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https://doi.org/10.3390/molecules30081847Publisher landing page
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https://www.mdpi.com/1420-3049/30/8/1847/pdf?version=1745133737Direct link to full text PDF
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goldOpen access status per OpenAlex
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https://www.mdpi.com/1420-3049/30/8/1847/pdf?version=1745133737Direct OA link when available
- Concepts
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Butane, Elastomer, Nickel, Polyethylene, Polymer chemistry, Materials science, Chemistry, Organic chemistry, CatalysisTop concepts (fields/topics) attached by OpenAlex
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2Total citation count in OpenAlex
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2025: 2Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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