Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: POSTERS Polymerphysics
CPP 34.45: Poster
Thursday, February 28, 2008, 17:00–19:30, Poster A
Microphase separation in cross-linked polymer melts — •Abigail Klopper1, Carsten Svaneborg2, and Ralf Everaers3 — 1Max-Planck-Institut für Physik komplexer Systeme, Dresden — 2Department of Chemistry and Interdisciplinary Nanoscience Center (iNano), University of Aarhus, Aarhus, Denmark — 3Université de Lyon, Laboratoire de Physique, École Normale Supérieure de Lyon, Lyon, France
Highly concentrated liquids comprising long polymeric chains can undergo a process of cross-linking, invoking the formation of a disordered solid with a frozen memory of its preparation conditions. The cross-linking creates quenched connective and topological disorder which plays a role familiar from glassy systems in breaking the translational symmetry of the initial liquid state. In mixtures of different polymer species interacting with one another, it is responsible for the inhibition of a bulk phase separation and the establishment of microphases on intermediate length scales.
We pair a replica formalism with data from large-scale molecular dynamics simulations of nearly ideal cross-linked polymer systems with purely repulsive monomer interactions. By combining simulation with theory in this way, we are able to describe neutron scattering measurements in microphase-separating systems with attractive monomer interactions, without resorting to exhaustive simulation. In doing so, we uncover system-specific effects relating to the intrinsic length scales of our networks.