Dresden 2017 – wissenschaftliches Programm

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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 60.5: Vortrag

Donnerstag, 23. März 2017, 16:15–16:30, ZEU 260

Topological Interactions in Dilute Polymer Solutions – Disentanglement of Two Single Chains — •Diddo Diddens1, Nam-Kyung Lee2, Sergei Obukhov3, Jörg Baschnagel1, and Albert Johner11Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, 23 Rue du Loess, 67034 Strasbourg Cedex 2, France — 2Institute of Fundamental Physics, Department of Physics, Sejong University, Seoul 05006, Korea — 3Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, United States

The non-crossing constraint of individual polymer chains is a well-known feature that explains several dynamical characteristics of dense polymer solutions or melts. However, the situation becomes less clear when dealing with an ensemble consisting of only a few long polymer chains that overlap, a scenario that is frequently encountered in e.g. biopolymer physics. To assess the impact of topological constraints in dilute polymer systems in a general manner, we devise a hypothetical experiment in which a long polymer chain is cleaved into two distinct halves that initially overlap, and study their subsequent disentanglement via Molecular Dynamics simulations [1]. We demonstrate that the non-crossing constraint significantly affects the separation dynamics, and quantify the associated relaxation times in terms of the topological properties of the starting configuration from which the cleavage is initiated. Moreover, we rationalize our findings by analytical arguments.

[1] D. Diddens et al., ACS Macro Lett., 2016, 5(6), 740-744

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