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Bimodality Criterion for the Chemical Composition Distribution of Ethylene/1-Olefin Copolymers: Theoretical Development and Experimental Validation

Authors

  • Kanyanut Narkchamnan,

    1. Center of Excellence for Petroleum, Petrochemicals and Advanced Materials (PPAM), Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, 50 Phaholyothin Rd., Jatujak, Bangkok 10900, Thailand
    2. Center for Advanced Studies in Nanotechnology and Its Applications in Chemical, Food and Agricultural Industries, Kasetsart University, Bangkok 10900, Thailand
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  • Siripon Anantawaraskul,

    Corresponding author
    1. Center of Excellence for Petroleum, Petrochemicals and Advanced Materials (PPAM), Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, 50 Phaholyothin Rd., Jatujak, Bangkok 10900, Thailand
    2. Center for Advanced Studies in Nanotechnology and Its Applications in Chemical, Food and Agricultural Industries, Kasetsart University, Bangkok 10900, Thailand
    • Center of Excellence for Petroleum, Petrochemicals and Advanced Materials (PPAM), Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, 50 Phaholyothin Rd., Jatujak, Bangkok 10900, Thailand. Fax: (662) 561 4621.
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  • João B.P. Soares

    1. Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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Abstract

Ethylene/1-olefin copolymers with controlled bimodal molecular weight distributions (MWDs) and chemical composition distributions (CCDs) have improved mechanical and rheological properties. In this work, the Stockmayer's distribution was used to develop a criterion for CCD bimodality. The proposed criterion was validated theoretically using simulation data and experimentally using crystallization analysis fractionation (CRYSTAF) and crystallization elution fractionation (CEF) of ethylene/1-octene copolymer blends. The effect of mass fraction and number average molecular weight of copolymer produced with each metallocene catalyst on CCD bimodality was also examined. The proposed criterion was then used as a benchmark for describing cocrystallization effects in both CRYSTAF and CEF techniques.

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