Viscoelasticity and nonlinear simple shear flow behavior of an entangled asymmetric exact comb polymer solution

Handle URI:
http://hdl.handle.net/10754/608238
Title:
Viscoelasticity and nonlinear simple shear flow behavior of an entangled asymmetric exact comb polymer solution
Authors:
Snijkers, F.; Kirkwood, K. M.; Vlassopoulos, D.; Leal, L. G.; Nikopoulou, A.; Hadjichristidis, Nikolaos ( 0000-0003-1442-1714 ) ; Coppola, S.
Abstract:
We report upon the characterization of the steady-state shear stresses and first normal stress differences as a function of shear rate using mechanical rheometry (both with a standard cone and plate and with a cone partitioned plate) and optical rheometry (with a flow-birefringence setup) of an entangled solution of asymmetric exact combs. The combs are polybutadienes (1,4-addition) consisting of an H-skeleton with an additional off-center branch on the backbone. We chose to investigate a solution in order to obtain reliable nonlinear shear data in overlapping dynamic regions with the two different techniques. The transient measurements obtained by cone partitioned plate indicated the appearance of overshoots in both the shear stress and the first normal stress difference during start-up shear flow. Interestingly, the overshoots in the start-up normal stress difference started to occur only at rates above the inverse stretch time of the backbone, when the stretch time of the backbone was estimated in analogy with linear chains including the effects of dynamic dilution of the branches but neglecting the effects of branch point friction, in excellent agreement with the situation for linear polymers. Flow-birefringence measurements were performed in a Couette geometry, and the extracted steady-state shear and first normal stress differences were found to agree well with the mechanical data, but were limited to relatively low rates below the inverse stretch time of the backbone. Finally, the steady-state properties were found to be in good agreement with model predictions based on a nonlinear multimode tube model developed for linear polymers when the branches are treated as solvent.
KAUST Department:
KAUST Catalysis Center (KCC); Polymer Synthesis Laboratory; Physical Sciences and Engineering (PSE) Division
Citation:
Viscoelasticity and nonlinear simple shear flow behavior of an entangled asymmetric exact comb polymer solution 2016, 60 (3):451 Journal of Rheology
Publisher:
Society of Rheology
Journal:
Journal of Rheology
Issue Date:
31-Mar-2016
DOI:
10.1122/1.4944993
Type:
Article
ISSN:
0148-6055; 1520-8516
Sponsors:
F.S. and D.V. acknowledge financial support by the EU through MC-ITN DYNACOP (Grant No. 214627). The authors thank G. Ianniruberto and G. Marrucci for helpful discussions.
Additional Links:
http://scitation.aip.org/content/sor/journal/jor2/60/3/10.1122/1.4944993
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorSnijkers, F.en
dc.contributor.authorKirkwood, K. M.en
dc.contributor.authorVlassopoulos, D.en
dc.contributor.authorLeal, L. G.en
dc.contributor.authorNikopoulou, A.en
dc.contributor.authorHadjichristidis, Nikolaosen
dc.contributor.authorCoppola, S.en
dc.date.accessioned2016-05-04T13:53:44Zen
dc.date.available2016-05-04T13:53:44Zen
dc.date.issued2016-03-31en
dc.identifier.citationViscoelasticity and nonlinear simple shear flow behavior of an entangled asymmetric exact comb polymer solution 2016, 60 (3):451 Journal of Rheologyen
dc.identifier.issn0148-6055en
dc.identifier.issn1520-8516en
dc.identifier.doi10.1122/1.4944993en
dc.identifier.urihttp://hdl.handle.net/10754/608238en
dc.description.abstractWe report upon the characterization of the steady-state shear stresses and first normal stress differences as a function of shear rate using mechanical rheometry (both with a standard cone and plate and with a cone partitioned plate) and optical rheometry (with a flow-birefringence setup) of an entangled solution of asymmetric exact combs. The combs are polybutadienes (1,4-addition) consisting of an H-skeleton with an additional off-center branch on the backbone. We chose to investigate a solution in order to obtain reliable nonlinear shear data in overlapping dynamic regions with the two different techniques. The transient measurements obtained by cone partitioned plate indicated the appearance of overshoots in both the shear stress and the first normal stress difference during start-up shear flow. Interestingly, the overshoots in the start-up normal stress difference started to occur only at rates above the inverse stretch time of the backbone, when the stretch time of the backbone was estimated in analogy with linear chains including the effects of dynamic dilution of the branches but neglecting the effects of branch point friction, in excellent agreement with the situation for linear polymers. Flow-birefringence measurements were performed in a Couette geometry, and the extracted steady-state shear and first normal stress differences were found to agree well with the mechanical data, but were limited to relatively low rates below the inverse stretch time of the backbone. Finally, the steady-state properties were found to be in good agreement with model predictions based on a nonlinear multimode tube model developed for linear polymers when the branches are treated as solvent.en
dc.description.sponsorshipF.S. and D.V. acknowledge financial support by the EU through MC-ITN DYNACOP (Grant No. 214627). The authors thank G. Ianniruberto and G. Marrucci for helpful discussions.en
dc.language.isoenen
dc.publisherSociety of Rheologyen
dc.relation.urlhttp://scitation.aip.org/content/sor/journal/jor2/60/3/10.1122/1.4944993en
dc.rightsArchived with thanks to Journal of Rheologyen
dc.titleViscoelasticity and nonlinear simple shear flow behavior of an entangled asymmetric exact comb polymer solutionen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPolymer Synthesis Laboratoryen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Rheologyen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionFoundation for Research and Technology Hellas (FORTH), Institute of Electronic Structure and Laser, Heraklion, Crete 70013, Greece and CNRS/Solvay UMR 5268, Laboratoire Polymères et Matériaux Avancés, Saint-Fons 69192, Franceen
dc.contributor.institutionDepartment of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106en
dc.contributor.institutionFoundation for Research and Technology Hellas (FORTH), Institute of Electronic Structure and Laser, Heraklion, Crete 70013, Greece and Department of Materials Science and Technology, University of Crete, Heraklion 71003, Crete, Greeceen
dc.contributor.institutionDepartment of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106en
dc.contributor.institutionDepartment of Chemistry, University of Athens, Athens 15784, Greeceen
dc.contributor.institutionCentro Ricerche Elastomeri, Versalis S.p.A., Ravenna, Italyen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorHadjichristidis, Nikolaosen
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