Show simple item record Xu, D Craig, SL
dc.coverage.spatial United States 2011-06-21T17:26:44Z 2010-06-03
dc.identifier.citation J Phys Chem Lett, 2010, 1 (11), pp. 1683 - 1686
dc.description.abstract Molecular theories of shear thickening and shear thinning in associative polymer networks are typically united in that they involve a single kinetic parameter that describes the network -- a relaxation time that is related to the lifetime of the associative bonds. Here we report the steady-shear behavior of two structurally identical metallo-supramolecular polymer networks, for which single-relaxation parameter models break down in dramatic fashion. The networks are formed by the addition of reversible cross-linkers to semidilute entangled solutions of PVP in DMSO, and they differ only in the lifetime of the reversible cross-links. Shear thickening is observed for cross-linkers that have a slower dissociation rate (17 s(-1)), while shear thinning is observed for samples that have a faster dissociation rate (ca. 1400 s(-1)). The difference in the steady shear behavior of the unentangled vs. entangled regime reveals an unexpected, additional competing relaxation, ascribed to topological disentanglement in the semidilute entangled regime that contributes to the rheological properties.
dc.format.extent 1683 - 1686
dc.language eng
dc.language.iso en_US en_US
dc.relation.ispartof J Phys Chem Lett
dc.relation.isversionof 10.1021/jz1004818
dc.title Multiple Dynamic Processes Contribute to the Complex Steady Shear Behavior of Cross-Linked Supramolecular Networks of Semidilute Entangled Polymer Solutions.
dc.title.alternative en_US
dc.type Journal Article
dc.description.version Version of Record en_US 2010-6-3 en_US
duke.description.endpage 1686 en_US
duke.description.issue 11 en_US
duke.description.startpage 1683 en_US
duke.description.volume 1 en_US
dc.relation.journal Journal of Physical Chemistry Letters en_US
pubs.issue 11
pubs.organisational-group /Duke
pubs.organisational-group /Duke/Trinity College of Arts & Sciences
pubs.organisational-group /Duke/Trinity College of Arts & Sciences/Chemistry
pubs.publication-status Published
pubs.volume 1
dc.identifier.eissn 1948-7185

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