Unexpected Stretching of Entangled Ring Macromolecules.

TitleUnexpected Stretching of Entangled Ring Macromolecules.
Publication TypeJournal Article
Year of Publication2019
AuthorsQ Huang, J Ahn, D Parisi, T Chang, O Hassager, S Panyukov, M Rubinstein, and D Vlassopoulos
JournalPhysical Review Letters
Start Page208001
Date Published05/2019

In the melt state at equilibrium, entangled nonconcatenated ring macromolecules adapt more compact conformations compared to their linear analogs and do not form an entanglement network. We show here that, when subjected to uniaxial stretching, they exhibit a unique response, which sets them apart from any other polymer. Remarkably, whereas both linear and ring polymers strain-harden, the viscosity of the rings increases dramatically (the melt thickens) at very low stretch rates due to the unraveling of their conformations along the stretching direction. At high rates, stretching leads to viscosity thinning similar to that of entangled linear polymers, albeit with subtle differences.

Short TitlePhysical Review Letters