FisMat2017 - Submission - View

Abstract's title: Glassiness and Heterogeneous Dynamics in Entangled Solutions of Ring Polymers
Submitting author: Negar Nahali
Affiliation: SISSA
Affiliation Address: Via Bonomea 265, Trieste, Italy
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Davide Michieletto (University of Edinburg, Edinburg, UK) Angelo Rosa (SISSA, Trieste, Italy)
Understanding how topological constraints affect the dynamics of polymers in solution is at the
basis of any polymer theory and it is particularly needed for melts of rings. These polymers fold
as crumpled and space-filling objects and, yet, they display a large number of topological con-
straints. To understand their role, here we systematically probe the response of solutions of rings at
various densities to “random pinning” perturbations. We show that these perturbations trigger non-
Gaussian and heterogeneous dynamics, eventually leading to non-ergodic and glassy behaviours. We
then derive universal scaling relations for the values of solution density and polymer length marking
the onset of vitrification in unperturbed solutions. Finally, we directly connect the heterogeneous
dynamics of the rings with their spatial organisation and mutual interpenetration. Our results
suggest that deviations from the typical behaviours observed in systems of linear polymers may
originate from architecture-specific (threading) topological constraints.