Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Poster: Polymer Dynamics

CPP 18.6: Poster

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

Oxidation dependent magnetism in Polyvinylferrocene-b-Poly-2-Vinylpyridine diblock copolymer — •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

Switching of conformation triggered by an external stimulus is a desired ability of a variety of polymers. In focus of our research is the ferrocene containing diblock copolymer polyvinylferrocene-b-poly-2-vinylpyridine (PVFc-P2VP) with molecular weights between 8000 and 16000 g/mol⁻¹ synthesized via sequential living anionic polymerization. The first block is a hydrophilic pyridine based polymer while the second part consists of a hydrophobic polymer containing a ferrocene moiety. This moiety has a strong influence on the properties such as magnetism, dynamic and solubility. SQUID measurements reveal that the magnetic susceptibility of the polymer can be changed by an oxidation agent from diamagnetic to paramagnetic. This effect depends on the characteristics of the polymer such as oxidation ratio and chain length. Furthermore the oxidation effects the conformational structure of the diblock copolymer which we investigate using X-Ray diffraction. The amphiphilic property enables the polymer to be analyzed as a monolayer on solid substrates as well as dissolved on a liquid surface, this gives the opportunity to change polymer conformation dependent on the mean molecular area. Results from the X-Ray reflectometry reveal a dependency of the layer thickness regarding oxidation.