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Study of triisobutylaluminum as cocatalyst and processing parameters on ethylene polymerization performance of α-diimine nickel(II) complex by response surface method

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Abstract

In this research work, 1,4-bis(2,6-diisopropylphenyl)-acenaphthenediimine-diboromonickel(II) (1) complex was synthesized and its ethylene polymerization in the presence of triisobutylaluminum (TIBA) as activator was studied. The effects of three critical factors [polymerization temperature (T), cocatalyst to catalyst ratio (CC) and pressure (P)] on the average molecular weight and crystallinity of the final polymers and also reaction yields as the response variables were evaluated with the help of empirical statistical models and visualized with the response surface method. The results show that activity of 1 as well as M w and crystallinity of the resulting polymers are influenced strongly by the polymerization factors. The activity of TIBA-activated catalyst 1 reaches a maximum at 10 °C after raising pressure and CC to 7 bar and 3,000, respectively. This activity is much higher than previously reported activity for this catalyst. Furthermore, a polymerization condition for reaching desirable responses is predicted and experimentally verified.

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Acknowledgments

The authors acknowledge the financial support of this work by National Petrochemical Company Research and Technology (NPC-RT).

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Authors and Affiliations

  1. Department of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran

    H. Arabi, M. S. Beheshti & N. Ghasemi Hamedani

  2. Department of Basic Sciences, Chemistry Group, Shahre Rey Branch, Islamic Azad University, P.O. Box 18155-144, Tehran, Iran

    M. S. Beheshti & M. Yousefi

  3. National Petrochemical Company (NPC), Research and Technology Company, Tehran, Iran

    N. Ghasemi Hamedani & M. Ghafelebashi

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  1. H. Arabi
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  2. M. S. Beheshti
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  3. M. Yousefi
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  4. N. Ghasemi Hamedani
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  5. M. Ghafelebashi
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Correspondence to H. Arabi.

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Arabi, H., Beheshti, M.S., Yousefi, M. et al. Study of triisobutylaluminum as cocatalyst and processing parameters on ethylene polymerization performance of α-diimine nickel(II) complex by response surface method. Polym. Bull. 70, 2765–2781 (2013). https://doi.org/10.1007/s00289-013-0986-0

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  • DOI: https://doi.org/10.1007/s00289-013-0986-0

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