Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Poster: Interfaces and Thin Films (joint session with DECHEMA and VDI)

CPP 9.18: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Influence of the Air/Water Interface on the Monolayer of Block Copolymers — •Christian Appel, Martin Kraska, and Bernd Stühn — Experimental Condensed Matters Physics, TU Darmstadt, Germany

Monolayers of special amphiphilic polymers are investigated in terms of compression behaviour and structure of the air/water (a/w) interface. We compare *bad/good* solvent conditions for two different polymer systems and study the morphology at the interface in dependency on the ruling surface pressure. In one of the polymer systems a hydrophobic polymer (polybutylacrylate) is anchored to the interface by a hydrophilic oligomer (polyethylenglycol). We compare this system with the complementary situation, where a hydrophilic polymer (poly-2-vinylpyridine) is anchored by a hydrophobic oligomer (polyvinylferrocene).

We recorded compression isotherms and studied the structure of the monolayers by X-Ray reflectometry in situ at the a/w interface an ex situ by the preparation of LB-films. These experiments lead to detailed structural pictures of the monolayers. We observed in situ the forming of a two-layer system in dependency of the surface pressure. In the semi-dilute regime we treat the monolayer systems as quasi 2D and quantify the influence of the water surface in terms of 2D power laws, e.g. the interface acts as a *bad/good* solvent for the monolayers, respectively.