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Synthesis and characterization of first- and second-generation polyamide pyridylimine nickel dihalide metallodendrimers and their uses as catalysts for ethylene polymerization

Ahamad, Tansir ; Alshehri, Saad M

Polymer international, 2014-11, Vol.63 (11), p.1965-1973 [Periódico revisado por pares]

Chichester, UK: John Wiley & Sons, Ltd

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  • Título:
    Synthesis and characterization of first- and second-generation polyamide pyridylimine nickel dihalide metallodendrimers and their uses as catalysts for ethylene polymerization
  • Autor: Ahamad, Tansir ; Alshehri, Saad M
  • Assuntos: Applied sciences ; catalyst ; Catalysts ; Dendrimers ; Ethylene ; Exact sciences and technology ; HDPE ; Inorganic and organomineral polymers ; LDPE ; Ligands ; Nickel ; oligomerization ; Organic polymers ; Physicochemistry of polymers ; Polyethylenes ; Polymerization ; Preparation ; Preparation, kinetics, thermodynamics, mechanism and catalysts ; Terminals
  • É parte de: Polymer international, 2014-11, Vol.63 (11), p.1965-1973
  • Notas: ark:/67375/WNG-RWF9TXLN-C
    MLDI-TOF-MS of G2LMLDI-TOF-MS of C213CNMR spectra of first generation dendrimeric ligand (G1L)13CNMR spectra of second generation dendrimeric ligand (G2L)
    ArticleID:PI4741
    istex:30F31A67367180038C9BEC567EF349564462F29A
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: First‐ and second‐generation pyridylimine‐terminated dendrimeric ligands were prepared by the reaction of corresponding amine‐terminated aromatic polyamide dendrimers with 2‐acetylpyridine. The pyridylimine terminal groups were used as bidentate N^N ligands of nickel halide to prepare the corresponding first‐generation and second‐generation nickel dihalide metallodendrimers C1 and C2, respectively. First‐ and second‐generation pyridylimine‐terminated dendrimeric ligands were prepared by the reaction of the corresponding amine‐terminated aromatic polyamide dendrimers with 2‐acetylpyridine. The pyridylimine terminal groups were used as bidentate N,N ligands of nickel halide to prepare the corresponding first‐generation and second‐generation nickel dihalide metallodendrimers C1 and C2, respectively. The synthesized dendrimers and metallodendrimers were characterized by elemental and spectral analyses. C1 and C2 were evaluated as catalyst precursors for ethylene oligomerization after being activated with methylaluminoxane (MAO) and diethylaluminum chloride (Et2AlCl) under 1 atm and 5 atm pressure of ethylene. In both cases, the use of 1 atm or 5 atm pressure of ethylene and a 1500:1 Al:Ni molar ratio for C1 and C2 resulted in high catalytic activities toward ethylene polymerization. Upon activation with MAO and Et2AlCl, C1 exhibited promising activities toward ethylene polymerization and produced linear chain structures that were associated with high density polyethylene. In contrast, C2 produced a polymer with the branching nature of low density polyethylene under similar conditions. © 2014 Society of Chemical Industry
  • Editor: Chichester, UK: John Wiley & Sons, Ltd
  • Idioma: Inglês
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