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Synthesis Characterization of Polyamide Metallodendrimers and their Catalytic Activities in Ethylene Oligomerization

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Abstract

Nickel complexes with aromatic amine terminated first generation (G1) and second generation (G2) polyamide dendrimers {POA-(NH2)n (n = 6 or 12, POM = Polyamide)} were synthesized. All the synthesized dendrimers and metallodendrimers were characterized by elemental and spectral analysis. These novel dendritic complexes were evaluated as catalyst precursors in the oligomerization of ethylene, using methylaluminoxane (MAO) as an activator at two different pressure and different Al/M (M = Zn) ratio. In the case of 1 atm pressure of ethylene, and 500:1 and 1,000:1 Al/Ni molar ratio, for C 1 and C 2 respectively display higher catalytic activity towards ethylene polymerization. Oligomerization using the generation 1 dendrimer complex, C 1 yields short chain oligomers whereas those obtained from the generation 2 dendrimer catalyst, C 2 resulted in longer chain products with molecular weights up to 9.54 × 104 and 9.86 × 104 g/mol at 1 and 5 atm respectively.

Graphical Abstract

Two new Nickel metallodendrimers C 1 and C 2 were evaluated as catalysts precursor in the polymerization of ethylene using methylaluminooxane (MOA) as co-catalyst at two different pressure and different Al/M (M = Zn) ratio. Both catalysts evaluated were found to be active for ethylene oligomerization giving polymers and higher molecular weight products.

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Acknowledgments

We would like to thanks the College of Science Research centre, King Saud University, for financial support under Grant No. CHEM/2010/10 and vice reactor of King Saud University.

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Authors and Affiliations

  1. Department of Chemistry, King Saud University, PO Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia

    Tansir Ahamad & Saad M. Alshehri

  2. Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa

    S. F. Mapolie

Authors
  1. Tansir Ahamad
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  2. Saad M. Alshehri
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  3. S. F. Mapolie
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Correspondence to Saad M. Alshehri.

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Ahamad, T., Alshehri, S.M. & Mapolie, S.F. Synthesis Characterization of Polyamide Metallodendrimers and their Catalytic Activities in Ethylene Oligomerization. Catal Lett 138, 171–179 (2010). https://doi.org/10.1007/s10562-010-0393-1

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  • DOI: https://doi.org/10.1007/s10562-010-0393-1

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