Show simple item record

dc.contributor.authorAdamu, Sagir
dc.contributor.authorAtiqullah, Muhammad
dc.contributor.authorMalaibari, Zuhair O.
dc.contributor.authorAl-Harthi, Mamdouh A.
dc.contributor.authorEmwas, Abdul-Hamid M.
dc.contributor.authorUl-Hamid, Anwar
dc.date.accessioned2016-01-31T13:52:22Z
dc.date.available2016-01-31T13:52:22Z
dc.date.issued2015-11-28
dc.identifier.citationMetallocene-catalyzed ethylene−α-olefin isomeric copolymerization: A perspective from hydrodynamic boundary layer mass transfer and design of MAO anion 2015 Journal of the Taiwan Institute of Chemical Engineers
dc.identifier.issn18761070
dc.identifier.doi10.1016/j.jtice.2015.10.031
dc.identifier.urihttp://hdl.handle.net/10754/595298
dc.description.abstractThis study reports a novel conceptual framework that can be easily experimented to evaluate the effects of hydrodynamic boundary layer mass transfer, methylaluminoxane (MAO) anion design, and comonomer steric hindrance on metallocene-catalyzed ethylene polymerization. This approach was illustrated by conducting homo- and isomeric copolymerization of ethylene with 1-hexene and 4-methyl-1-pentene in the presence of bis(n-butylcyclopentadienyl) zirconium dichloride (nBuCp)2ZrCl2, using (i) MAO anion 1 (unsupported [MAOCl2]−) and pseudo-homogeneous reference polymerization, and (ii) MAO anion 2 (supported Si−O−[MAOCl2]−) and in-situ heterogeneous polymerization. The measured polymer morphology, catalyst productivity, molecular weight distribution, and inter-chain composition distribution were related to the locus of polymerization, comonomer effect, in-situ chain transfer process, and micromixing effect, respectively. The peak melting and crystallization temperatures and %crystallinity were mathematically correlated to the parameters of microstructural composition distributions, melt fractionation temperatures, and average lamellar thickness. These relations showed to be insightful. The comonomer-induced enchainment defects and the eventual partial disruption of the crystal lattice were successfully modeled using Flory and Gibbs–Thompson equations. The present methodology can also be applied to study ethylene−α-olefin copolymerization, performed using MAO-activated non-metallocene precatalysts.
dc.language.isoen
dc.publisherElsevier BV
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S1876107015004721
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of the Taiwan Institute of Chemical Engineers. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of the Taiwan Institute of Chemical Engineers, 28 November 2015. DOI: 10.1016/j.jtice.2015.10.031
dc.subjectMetallocene catalyst
dc.subjectPseudo-homogeneous and in-situ heterogeneous isomeric ethylene−α-olefin copolymerization
dc.subjectHydrodynamic boundary layer mass transfer
dc.subjectInter- and intra-chain backbone composition distribution
dc.subjectLamellar thickness distribution
dc.subjectThermal properties
dc.titleMetallocene-catalyzed ethylene−α-olefin isomeric copolymerization: A perspective from hydrodynamic boundary layer mass transfer and design of MAO anion
dc.typeArticle
dc.contributor.departmentImaging and Characterization Core Lab
dc.contributor.departmentNMR
dc.identifier.journalJournal of the Taiwan Institute of Chemical Engineers
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
dc.contributor.institutionCenter for Refining and Petrochemicals, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
dc.contributor.institutionCenter for Engineering Research, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personEmwas, Abdul-Hamid M.
refterms.dateFOA2017-11-28T00:00:00Z
dc.date.published-online2015-11-28
dc.date.published-print2016-03


Files in this item

Thumbnail
Name:
Polymer_TTIofchem-Eng.pdf
Size:
2.813Mb
Format:
PDF
Description:
Accepted Manuscript
Thumbnail
Name:
1-s2.0-S1876107015004721-fx1.jpg
Size:
10.63Kb
Format:
JPEG image
Description:
Graphical abstract

This item appears in the following Collection(s)

Show simple item record