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dc.contributor.authorHall, Ryan
dc.contributor.authorKang, Beom-Goo
dc.contributor.authorLee, Sanghoon
dc.contributor.authorChang, Taihyun
dc.contributor.authorVenerus, David C.
dc.contributor.authorHadjichristidis, Nikos
dc.contributor.authorMays, Jimmy
dc.contributor.authorLarson, Ronald G.
dc.date.accessioned2019-04-09T06:58:11Z
dc.date.available2019-04-09T06:58:11Z
dc.date.issued2019-02-11
dc.identifier.citationHall R, Kang B-G, Lee S, Chang T, Venerus DC, et al. (2019) Determining the Dilution Exponent for Entangled 1,4-Polybutadienes Using Blends of Near-Monodisperse Star with Unentangled, Low Molecular Weight Linear Polymers. Macromolecules 52: 1757–1771. Available: http://dx.doi.org/10.1021/acs.macromol.8b01828.
dc.identifier.issn0024-9297
dc.identifier.issn1520-5835
dc.identifier.doi10.1021/acs.macromol.8b01828
dc.identifier.urihttp://hdl.handle.net/10754/631840
dc.description.abstractWe determine experimentally the “dilution exponent” α for entangled polymers from the scaling of terminal crossover frequency with entanglement density from the linear rheology of three 1,4-polybutadiene star polymers that are blended with low-molecular-weight, unentangled linear 1,4-polybutadiene at various star volume fractions, ϕs. Assuming that the rheology of monodisperse stars depends solely on the plateau modulus GN(ϕs) ∝ ϕs1+α, the number of entanglements per chain Me(ϕs) ∝ ϕs–α, and the tube-segment frictional Rouse time τe(ϕs) ∝ ϕs–2α, we show that only an α = 1 scaling superposes the Me(ϕs) dependence of the terminal crossover frequency ωx,t of the blends with those of pure stars, not α = 4/3. This is the first determination of α for star polymers that does not rely on any particular tube model implementation. We also show that a generalized tube model, the “Hierarchical model”, using the “Das” parameter set with α = 1 reasonably predicts the rheological data of the melts and blends featured in this paper.
dc.description.sponsorshipR.H. and R.G.L. gratefully acknowledge the support of the National Science Foundation under Grants DMR 1403335 and 1707640. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation (NSF). N.H. gratefully acknowledges the support of the King Abdullah University of Science and Technology (KAUST).
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acs.macromol.8b01828
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.macromol.8b01828.
dc.titleDetermining the Dilution Exponent for Entangled 1,4-Polybutadienes Using Blends of Near-Monodisperse Star with Unentangled, Low Molecular Weight Linear Polymers
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentPolymer Synthesis Laboratory
dc.identifier.journalMacromolecules
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Macromolecular Science & Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
dc.contributor.institutionDepartment of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
dc.contributor.institutionDepartment of Chemistry and Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
dc.contributor.institutionDepartment of Chemical and Biological Engineering, and Center for Molecular Study of Condensed Soft Matter, Illinois Institute of Technology, Chicago, Illinois 60616, United States
dc.contributor.institutionDepartment of Chemical and Materials Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
dc.contributor.institutionDepartment of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
kaust.personHadjichristidis, Nikos
refterms.dateFOA2020-02-11T00:00:00Z
dc.date.published-online2019-02-11
dc.date.published-print2019-02-26


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