Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 60: Focus: Topological Problems in the Physics of Polymers, Biopolymers and Fibers I (joint session BP/CPP, organized by CPP)

CPP 60.3: Talk

Thursday, March 23, 2017, 15:45–16:00, ZEU 260

Density effects in entangled solutions of linear and ring polymers — •Negar Nahali and Angelo Rosa — SISSA - Scuola Internazionale Superiore di Studi Avanzati, Via Bonomea 265, 34136 Trieste, Italy

We present here recent [1] findings from molecular dynamics computer simulations regarding the statics and dynamics of linear and circular (ring) polymer chains in entangled solutions of different densities.

While we confirm that linear chain conformations obey Gaussian statistics at all densities, rings tend to crumple becoming more and more compact as the density increases. Conversely, contact frequencies between chain monomers are shown to depend on solution density for both chain topologies.

The relaxation of chains at equilibrium is also shown to depend on topology, with ring polymers relaxing faster than their linear counterparts. Finally, we discuss the local viscoelastic properties of the solutions by showing that the diffusion of dispersed colloid-like particles is markedly faster in the rings case [1,2].

[1] N. Nahali, A. Rosa, Journal of Physics: Condensed Matter 28, 065101 (2016)

[2] N. Nahali, A. Rosa, in preparation.