High molecular weight PE elastomers through 4,4-difluorobenzhydryl substitution in symmetrical α-diimino-nickel ethylene polymerization catalysts

Zheng, Yuting; Jiang, Shu; Liu, Ming; Yu, Zhixin; Ma, Yanping; Solan, Gregory A.; Zhang, Wenjuan; Liang, Tongling; Sun, Wen‐Hua

doi:10.1039/d2ra04321a

RSC Adv.

2022

DOI: 10.1039/d2ra04321a

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High molecular weight PE elastomers through 4,4-difluorobenzhydryl substitution in symmetrical α-diimino-nickel ethylene polymerization catalysts

Yuting Zheng

Shu Jiang

Ming Liu

et al.

Abstract: N,N-Diaryl-2,3-dimethyl-1,4-diazabutadiene-nickel complexes appended with 4,4-difluorobenzhydryl groups can efficiently mediate the formation of polyethylene elastomers with molecular weights approaching one million g mol−1.

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Cited by 6 publications

References 90 publications

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Amino‐containing α‐Diimine Nickel Complexes with Adjustable Electronic Properties and their Effective Use in Forming Highly Branched Polyethylene

Zhang,

Wang,

Wang

et al. 2024

Macro Chemistry & Physics

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A family of ten amino‐containing bis(arylimino)acenaphthene‐nickel (II) bromide complexes varied in the electronic properties of para‐substituents (R = Me, iPr, tBu, OMe, Cl, F, NO2) as well as two amino‐free comparators (R = Me, Cl) are synthesized in good yield from their corresponding unsymmetrical N,N’‐ligands. All organic compounds are well characterized by different analysis techniques. On activation with Me2AlCl, all nickel complexes exhibit moderate to high activities with a maximum activity up to 14.19 × 106 g (PE) mol−1 (Ni) h−1 and deliver narrow dispersed polyethylene (PDI: 1.85–2.65) with adjustable molecular weight values (Mw: 5.27–18.49 × 105 g mol−1). The presence of remote fluoro‐ group and (4‐amino‐3,5‐dimethylphenyl)(phenyl)methyl group has their own unique influence on activity due to their different electronic and steric properties. Nevertheless, the latter with higher steric hindrance results in better thermal stability of the current catalytic system. Moreover, all polyethylene is highly branched and exhibits typical characteristics of thermoplastic elastomers, especially good mechanical properties (εb up to 1175%) and elastic recovery rate (up to 86%).

show abstract

Amino‐containing α‐Diimine Nickel Complexes with Adjustable Electronic Properties and their Effective Use in Forming Highly Branched Polyethylene

Zhang,

Wang,

Wang

et al. 2024

Macro Chemistry & Physics

View full text Add to dashboard Cite

show abstract

Fluorine and hydroxyl containing unsymmetrical a-diimine Ni (II) dichlorides with improved catalytic performance for ethylene polymerization

Stieglitz

Lehner

et al. 2023

European Polymer Journal

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Thermally stable unsymmetrical 2,3-diiminobutane-nickel pre-catalysts for synthesis of high molecular weight polyethylene elastomers

Li,

Qin,

Mahmood

et al. 2023

European Polymer Journal

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High molecular weight PE elastomers through 4,4-difluorobenzhydryl substitution in symmetrical α-diimino-nickel ethylene polymerization catalysts

Abstract: N,N-Diaryl-2,3-dimethyl-1,4-diazabutadiene-nickel complexes appended with 4,4-difluorobenzhydryl groups can efficiently mediate the formation of polyethylene elastomers with molecular weights approaching one million g mol−1.

Cited by 6 publications

References 90 publications

Amino‐containing α‐Diimine Nickel Complexes with Adjustable Electronic Properties and their Effective Use in Forming Highly Branched Polyethylene

Amino‐containing α‐Diimine Nickel Complexes with Adjustable Electronic Properties and their Effective Use in Forming Highly Branched Polyethylene

Fluorine and hydroxyl containing unsymmetrical a-diimine Ni (II) dichlorides with improved catalytic performance for ethylene polymerization

Thermally stable unsymmetrical 2,3-diiminobutane-nickel pre-catalysts for synthesis of high molecular weight polyethylene elastomers

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