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    (nBuCp)2ZrCl2-catalyzed Ethylene-4M1P Copolymerization: Copolymer Backbone Structure, Melt Behavior, and Crystallization

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    Name:
    Atiqullah_et_al-2016-AIChE_Journal.pdf
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    2.550Mb
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    PDF
    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    Atiqullah, Muhammad
    Adamu, Sagir
    Malaibari, Zuhair O.
    Al-Harthi, Mamdouh A.
    Emwas, Abdul-Hamid M.
    KAUST Department
    Imaging and Characterization Core Lab
    NMR
    Date
    2016-01-26
    Online Publication Date
    2016-01-26
    Print Publication Date
    2016-05
    Permanent link to this record
    http://hdl.handle.net/10754/593662
    
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    Abstract
    The judicious design of methylaluminoxane (MAO) anions expands the scope for developing industrial metallocene catalysts. Therefore, the effects of MAO anion design on the backbone structure, melt behavior, and crystallization of ethylene−4-methyl-1-pentene (E−4M1P) copolymer were investigated. Ethylene was homopolymerized, as well as copolymerized with 4M1P, using (i) MAO anion A (unsupported [MAOCl2]−) premixed with dehydroxylated silica, (nBuCp)2ZrCl2, and Me2SiCl2; and (ii) MAO anion B (Si−O−Me2Si−[MAOCl2]−) supported with (nBuCp)2ZrCl2 on Me2SiCl2-functionalized silica. Unsupported Me2SiCl2, opposite to the supported analogue, acted as a co-chain transfer agent with 4M1P. The modeling of polyethylene melting and crystallization kinetics, including critical crystallite stability, produced insightful results. This study especially illustrates how branched polyethylene can be prepared from ethylene alone using particularly one metallocene-MAO ion pair, and how a compound, that functionalizes silica as well as terminates the chain, can synthesize ethylene−α-olefin copolymers with novel structures. Hence, it unfolds prospective future research niches in polyethyne systhesis. This article is protected by copyright. All rights reserved.
    Citation
    (nBuCp)2ZrCl2-catalyzed Ethylene-4M1P Copolymerization: Copolymer Backbone Structure, Melt Behavior, and Crystallization 2016:n/a AIChE Journal
    Publisher
    Wiley
    Journal
    AIChE Journal
    DOI
    10.1002/aic.15159
    Additional Links
    http://doi.wiley.com/10.1002/aic.15159
    ae974a485f413a2113503eed53cd6c53
    10.1002/aic.15159
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab

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