Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Poster: Polymer Dynamics

CPP 18.2: Poster

Dienstag, 12. März 2013, 18:15–20:15, Poster C

Behavior of AB-Diblock-Copolymer chains under the influence of external Stimuli - An AFM Study — •Kirsten Dammertz, Anne-Marie Saier, Masoud Amirkhani, Martin Mueller, and Othmar Marti — Institute of Experimental Physics, Ulm University

Concerning the constantly growing demand of advanced materials with special characteristics on nanoscale, e.g. reconfigurable nanowires, the properties and interactions of various polymers adsorbed on surfaces are still a research topic of major interest. Several methods to initiate conformational changes and reorientations are described in literature by different authors. Vapors or 2D pressure can be used to induce a collapse/decolapse cycle of single polymer chains in consequence of a coadsorption process, electric fields can be applied to align the molecules just as well as to change the surface properties of the substrate. Although the mechanisms of these observations are often analyzed, the basic driving forces are still not well understood.

In this work, novel effects of externally stimulated linear- and AB-block-copolymer chains interacting with several surfaces are presented. The molecules gain unexpectedly high mobility and show conformational changes under specific conditions and the presence of an external electric field. Varying from single molecule chains to thin polymer films, the underlying physical effects are systematically investigated and discussed.