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dc.contributor.authorPasquino, Rossana
dc.contributor.authorVasilakopoulos, Thodoris C.
dc.contributor.authorJeong, Youncheol
dc.contributor.authorLee, Hyojoon
dc.contributor.authorRogers, Simon A.
dc.contributor.authorSakellariou, Georgios
dc.contributor.authorAllgaier, Jürgen B.
dc.contributor.authorTakano, Atsushi
dc.contributor.authorBrás, Ana Rita E
dc.contributor.authorChang, Taihyun
dc.contributor.authorGooßen, Sebastian
dc.contributor.authorPyckhout-Hintzen, Wim
dc.contributor.authorWischnewski, Andreas
dc.contributor.authorHadjichristidis, Nikolaos
dc.contributor.authorRichter, Dieter R.
dc.contributor.authorRubinstein, Michael H.
dc.contributor.authorVlassopoulos, Dimitris
dc.date.accessioned2015-08-03T11:34:24Z
dc.date.available2015-08-03T11:34:24Z
dc.date.issued2013-10-15
dc.identifier.issn21611653
dc.identifier.doi10.1021/mz400344e
dc.identifier.urihttp://hdl.handle.net/10754/563041
dc.description.abstractWe have measured the linear rheology of critically purified ring polyisoprenes, polystyrenes, and polyethyleneoxides of different molar masses. The ratio of the zero-shear viscosities of linear polymer melts η0,linear to their ring counterparts η0,ring at isofrictional conditions is discussed as a function of the number of entanglements Z. In the unentangled regime η0,linear/η 0,ring is virtually constant, consistent with the earlier data, atomistic simulations, and the theoretical expectation η0,linear/ η0,ring = 2. In the entanglement regime, the Z-dependence of ring viscosity is much weaker than that of linear polymers, in qualitative agreement with predictions from scaling theory and simulations. The power-law extracted from the available experimental data in the rather limited range 1 < Z < 20, η0,linear/η0,ring ∼ Z 1.2±0.3, is weaker than the scaling prediction (η0,linear/η0,ring ∼ Z 1.6±0.3) and the simulations (η0,linear/ η0,ring ∼ Z2.0±0.3). Nevertheless, the present collection of state-of-the-art experimental data unambiguously demonstrates that rings exhibit a universal trend clearly departing from that of their linear counterparts, and hence it represents a major step toward resolving a 30-year-old problem. © 2013 American Chemical Society.
dc.description.sponsorshipWe are grateful to Frank Snijkers, Hiroshi Watanabe, Jorg Baschnagel, and Vlasis Mavrantzas for helpful discussions. We acknowledge partial support from EU (ITN DYNACOP, grant 214627; FP7 Infrastructure ESMI, GA 262348). T.C. acknowledges the support from NRF (2008-0061892 and 2012R1A2A2A01015148). MR acknowledges support from the NSF, grants CHE-0911588, DMR-0907515, DMR-1121107, and DMR-1122483, the NIH, 1-P5-HL107168, 1-P01-HL108808-01A1, and the Cystic Fibrosis Foundation.
dc.publisherAmerican Chemical Society (ACS)
dc.titleViscosity of ring polymer melts
dc.typeArticle
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentChemical Science Program
dc.contributor.departmentPolymer Synthesis Laboratory
dc.identifier.journalACS Macro Letters
dc.contributor.institutionFORTH, Institute for Electronic Structure and Laser, Heraklion 71110, Greece
dc.contributor.institutionDepartment of Chemistry, University of Athens, Athens 15771, Greece
dc.contributor.institutionDivision of Advanced Materials Science, Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, South Korea
dc.contributor.institutionForschungszentrum Jülich GmbH, Jülich 52428, Germany
dc.contributor.institutionDepartment of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
dc.contributor.institutionDepartment of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, United States
dc.contributor.institutionDepartment of Materials Science and Technology, University of Crete, Heraklion 71003, Greece
dc.contributor.institutionDepartment of Chemical Engineering, Materials and Industrial Production, University of Napoli Federico II, P.le Tecchio 80, 80125 Napoli, Italy
kaust.personHadjichristidis, Nikolaos


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