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Polymerization of propylene catalyzed by α-diimine nickel complexes/methylaluminoxane: catalytic behavior and polymer properties

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Abstract

α-Diimine nickel dibromide complexes of dibromo[N,N’-bis(2,6-diisopropylphenyl)-2,3-butanediimine]nickel(II) (A) and dibromo[N,N’-(phenanthrene-9,10-diylidene)bis(2,6-diisopropylaniline)]nickel(II) (B) were synthesized under controlled conditions. The catalysts A, B and mixed of 1:1 weight ratio of them (C) were activated by methylaluminoxane and were used for propylene polymerization in a semi-batch reactor. In study of the catalytic systems behavior, activities, glass transition temperature (T g) and viscosity average molecular weight (M v) values related to the catalyst C were between those related to the catalysts A and B under same conditions. The highest and the lowest molecular weights of the obtained polymers were produced by the catalysts B and A which were about 80,000 and 70,000 (g/mol) under same conditions, respectively. The T g of polypropylenes produced by the catalysts was about −34 °C. The resulting polymers had similar behavior with ethylene-propylene copolymer which it could be due to formation of ethylene-type units in the polymer chain.

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Acknowledgments

The authors express their appreciation to the Ferdowsi University of Mashhad for supporting the research project. Also, we thank the NMR laboratory of Tabriz University and DSC laboratory of Polymer and Petrochemical Institute of Iran.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, PO Box 1436, Mashhad, Iran

    Hamid Pourtaghi-Zahed & Gholam Hossein Zohuri

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  1. Hamid Pourtaghi-Zahed
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  2. Gholam Hossein Zohuri
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Correspondence to Gholam Hossein Zohuri.

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Pourtaghi-Zahed, H., Zohuri, G.H. Polymerization of propylene catalyzed by α-diimine nickel complexes/methylaluminoxane: catalytic behavior and polymer properties. Polym. Bull. 70, 1769–1780 (2013). https://doi.org/10.1007/s00289-013-0920-5

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  • DOI: https://doi.org/10.1007/s00289-013-0920-5

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