Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: P1: Interfaces and Thin Films

CPP 15.5: Poster

Monday, March 16, 2015, 16:00–19:00, Poster A

Structural investigation of ferrocene containing polymers in thin films and at the liquid/air interface — •Haiko Didzoleit¹, Markus Gallei², Johannes Elbert², Matthias Rehahn², and Bernd Stühn¹ — ¹TU Darmstadt, Experimental Condensed Matter Physics — ²TU Darmstadt. Ernst-Berl-Institut für Technische und Makromolekulare Chemie

We focus on amphiphilic ferrocene block copolymers (here poly(vinyl ferrocene)-b-poly(vinyl pyridin), PVFc-P2VP and poly(ferrocenylsilane)- poly(vinyl pyridin) PFS-P2VP) and their structural properties at liquid/air and solid/air interfaces. These films are prepared as Langmuir monolayers on a water substrate and as Langmuir-Blodgett multilayer films on a solid silicon substrate. The structural properties are monitored by X-Ray reflectivity in situ (water subphase) and ex situ (silicon substrate) and analysed in terms of standard models.

The structure of the Langmuir monolayer is dominated by the P2VP block partner and strongly ruled by the surface pressure in the monolayer. Besides their structural changes the ferrocene moiety can be reversibly switched from diamagnetic to paramagnetic state by oxidation/reduction. We determine the magnetic properties of thin films by SQUID magnetometry. The oxidised state induces a conformational change leading to a swelling of the polymer film on solid substrates and to increasing solubility in water. The impact of these external variables on the structural properties will be shown for different composites of the diblock copolymer.