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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 85: Focus: Polymers under confinement I

CPP 85.5: Vortrag

Donnerstag, 19. März 2020, 10:45–11:00, ZEU 222

Kinetically trapped chiral structures of diblock copolymers in cylindrical confinement — •Ludwig Schneider, Georg Lichtenberg, and Marcus Müller — Institut für Theoretische Physik, Georg-August Universität Göttingen

Reproducibly manufacturing morphologies of diblock copolymers inside cylindrical confinements is a long-standing question in directed self-assembly. It has been explored both in experiments and simulations. For non-neutral cylinder walls, it is expected that concentric lamellae are formed.

However, we discover interesting long-lived helical structures via large-scale Single-Chain-in-Mean-Field (SCMF) simulations. The requirements for these structures are neutral interactions between the confinement and the two polymer species and an incommensurable cylinder length with the natural lamellar spacing.

We believe the structures to be meta-stable but long-lived. The kinetic pathway after a spinodal decomposition consistently drives the morphology towards the helical structures. After the meta-stable structure is formed, it is long-lived because a transition towards equilibrium requires a global remodeling of the morphology -- accompanied by a high free-energy barrier.