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Ethylene polymerization over TiSSP composite-supported MAO with bis[N-(3-tert-butylsalicylidene) cycloheptylamine] titanium dichloride complex

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Abstract

The following study focuses on the reduction of the required amounts of MAO after the addition of Ti into the prepared spherical silica particle (SSP) to obtain TiSSP as a support of the bis(phenoxy–imine) Ti-based catalyst used for ethylene polymerization. The ethylene polymerization was carried out via the introduction of SSP and TiSSP-supported MAO with various MAO contents, followed by adding the bis(phenoxy–imine) Ti-based catalyst. The characteristics of SSP and Ti-modified SSP were determined by XRD, BET, FTIR, and NH3-TPD. There was evidence of the presence of Ti–O–Si bond and the increase of acidity with the introduction of Ti into SSP. Interestingly, the increased acidity on the surface of TiSSP composites was found to be the crucial characteristic, which played an important role on the reduction of the required amounts of MAO. It is suggested that the modification of SSP with Ti is able to decrease (by ca. 22%) the consumption of the required amounts of MAO for polymerization. In other words, the lower ratio of MAO to catalyst for TiSSP was observed for the identical value of activity obtained from SSP. The produced polymers were thoroughly identified by DSC and SEM techniques. All polyethylenes obtained using TiSSP exhibited higher crystallinity than those obtained from SSP support. Finally, employing the TiSSP-supported bis(phenoxy–imine), Ti-based catalyst leads to producing the polymer with lamellar structure that seemed to be corresponding to the crystalline structure as was confirmed by DSC results.

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Acknowledgements

The authors thank the Thailand Research Fund (IRG5780014) and Grant for International Research Integration: Chula Research Scholar, Ratchadaphisek Somphot Endowment Fund (2016) for the financial support of this project. They also would like to thank Postdoctoral Scholarship (Chulalongkorn University) for supporting this research.

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Authors and Affiliations

  1. Department of Chemical Engineering, Faculty of Engineering, Center of Excellence on Catalysis and Catalytic Reaction Engineering, Chulalongkorn University, Bangkok, 10330, Thailand

    Jakrapan Janlamool & Bunjerd Jongsomjit

  2. PTT Research and Technology Institute, PTT Public Company Limited, Wangnoi, Ayuthaya, 13170, Thailand

    Supaporn Khaubunsongserm

Authors
  1. Jakrapan Janlamool
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  3. Bunjerd Jongsomjit
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Correspondence to Bunjerd Jongsomjit.

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Janlamool, J., Khaubunsongserm, S. & Jongsomjit, B. Ethylene polymerization over TiSSP composite-supported MAO with bis[N-(3-tert-butylsalicylidene) cycloheptylamine] titanium dichloride complex. Iran Polym J 26, 775–784 (2017). https://doi.org/10.1007/s13726-017-0563-8

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  • DOI: https://doi.org/10.1007/s13726-017-0563-8

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