MgCl2-supported catalyst containing mixed internal donors for propylene polymerization

Authors

  • Futang Gao,

    1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    2. Beijing Research Institute of Chemical Industry, SINOPEC, Beijing 100013, China
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  • Xianzhi Xia,

    1. Beijing Research Institute of Chemical Industry, SINOPEC, Beijing 100013, China
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  • Bingquan Mao

    Corresponding author
    1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    2. Beijing Research Institute of Chemical Industry, SINOPEC, Beijing 100013, China
    • College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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Abstract

A MgCl2-supported catalyst containing diisobutyl phthalate (DIBP) and 2,4-pentadiol dibenzoate (PDDB) as internal donors was prepared. Propylene polymerizations were carried out using the catalyst in the absence or presence of an external donor. The resulting polymers were characterized by 13C-NMR, crystallization analysis fraction (CRYSTAF) and gel permeation chromatography (GPC). The performance of the catalyst was compared with that of other catalysts containing donor-free, DIBP and PDDB as internal donors respectively. The results demonstrated that the catalyst containing mixed internal donors not only had high activity and stereospecificity but also produced the polymer with relatively broad molecular weight distribution and the highest [mmmm] value. 13C-NMR analysis results indicated that strongly coordinating donors gave more stereoregular polymers, which was further confirmed by CRYSTAF data. The effects of mixed internal donors on the catalyst properties were discussed systematically. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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