Concentrated Polymer Solutions are Different from Melts: Role of Entanglement Molecular Weight

Qian Huang, Olga Mednova, Henrik K. Rasmussen, Nicolas Javier Alvarez, Anne Ladegaard Skov, Kristoffer Almdal, Ole Hassager

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We compare viscoelastic properties of several polystyrene solutions and melts with the same number of entanglements. It is demonstrated that the modulus and time can be shifted such that the linear viscoelastic properties are identical provided the number of entanglements are identical. However the nonlinear properties in strong extensional flow are different with polymer solutions showing markedly stronger extensional hardening than the corresponding melts. While increased chain extensibility for solutions may provide part of the explanation, it is demonstrated that other mechanisms are needed for a full explanation for the differences between solutions and melts.
Original languageEnglish
JournalMacromolecules
Volume46
Issue number12
Pages (from-to)5026–5035
Number of pages10
ISSN0024-9297
DOIs
Publication statusPublished - 2013

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