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Characteristics of diether- and phthalate-based Ziegler-Natta catalysts for copolymerization of propylene and ethylene and terpolymerization of propylene, ethylene, and 1-butene

Authors

  • Bo Geun Song,

    1. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
    2. Research Institute, Lotte Chemical Corporation, Daejeon 305-726, Republic of Korea
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  • Young Heon Choi,

    1. Research Institute, Lotte Chemical Corporation, Daejeon 305-726, Republic of Korea
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  • Son-Ki Ihm

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
    • Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-Gu, Daejeon 305-701, Republic of Korea. E-mail: skihm@kaist.ac.kr

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Abstract

Copolymerization of propylene and ethylene and terpolymerization of propylene, ethylene, and 1-butene were carried out to compare the characteristics of diether- and phthalate-based Ziegler-Natta catalysts in a reaction system of pilot scale. The ethylene incorporation with the diether-based catalyst was higher but the 1-butene incorporation was lower compared with those of the phthalate-based catalyst. In the case of copolymers from the diether-based catalyst, melting behavior, determined through differential scanning calorimetry (DSC), showed a distinct shoulder peak and lots of nuclei were formed during crystallization. The diether-based catalyst led to polymers having blockier ethylene sequences compared with those of the phthalate-based catalyst; the highly crystallizable fraction (HIS) containing blockier ethylene sequences was produced with the diether-based catalyst. These results seem to be the result of regio-irregular characteristics of the diether-based catalyst. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 851-859, 2013

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