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Investigation on Decomposition Kinetic and Thermal Stability of Metallocene Catalysts

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Abstract

Data on thermal stability of metallocene catalysts such as bis(n-butyl cyclopentadienyl) zirconium dichloride and bis(t-butyl cyclopentadienyl) zirconium dichloride is required because of their application in high temperature polymerization process. In the present study, the thermal stability of the bis(n-butyl cyclopentadienyl) zirconium dichloride and bis(t-butyl cyclopentadienyl) zirconium dichloride was determined by differential scanning calorimetry (DSC) and simultaneous thermogravimetry-differential thermal analysis (TG-DTA) techniques. The results of TG analysis revealed that the main thermal degradation for the bis(n-butyl cyclopentadienyl) zirconium dichloride and bis(t-butyl cyclopentadienyl) zirconium dichloride occurs in the temperature ranges of 194–360 °C and 195–350 °C, respectively. On the other hand, TG-DTA analysis indicated that bis(n-butyl cyclopentadienyl) zirconium dichloride melts (about 98.7 °C) before it decomposes. However, the thermal decomposition of the bis(t-butyl cyclopentadienyl) zirconium dichloride was started simultaneously with its melting. Also, the kinetic parameters such as activation energy and frequency factor for both compounds were obtained from the DSC data by non-isothermal methods proposed by Kissinger and Ozawa. Based on the values of activation energy obtained by Kissinger and Ozawa methods, the following order for the thermal stability was noticed: bis(t-butyl cyclopentadienyl) zirconium dichloride >bis(n-butyl cyclopentadienyl) zirconium dichloride. Finally, the values of ΔS#, ΔH# and ΔG# of their decomposition reaction were calculated.

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Authors and Affiliations

  1. National Petrochemical Company (NPC), Research and Technology Company (R&T), Tehran, Iran

    F. Azimfar

  2. Faculty of Material and Manufacturing Technologies, Malek Ashtar University of Technology, P.O. Box 16765-3454, Tehran, Iran

    I. Kohsari & S. M. Pourmortazavi

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  1. F. Azimfar
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  2. I. Kohsari
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  3. S. M. Pourmortazavi
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Correspondence to S. M. Pourmortazavi.

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Azimfar, F., Kohsari, I. & Pourmortazavi, S.M. Investigation on Decomposition Kinetic and Thermal Stability of Metallocene Catalysts. J Inorg Organomet Polym 19, 181–186 (2009). https://doi.org/10.1007/s10904-009-9258-8

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  • DOI: https://doi.org/10.1007/s10904-009-9258-8

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