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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster Session II

CPP 49.1: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1A

The Influence of Side Chain Linkage on Bulk Structure and Orientation in Thin Films of Ethylene Glycol Substituted Polythiophenes — •Robert Kahl¹, Oleksandr Dolynchuk¹, Philip Schmode², Mukundan Thelakkat², and Thomas Thurn-Albrecht¹ — ¹Experimental Polymer Physics, Martin Luther University Halle-Wittenberg, Germany — ²Applied Functional Polymers, University of Bayreuth, Germany

Polythiophenes with ethylene glycol side chains exhibit ionic as well as electronic charge transport, making them promising materials for application in organic electrochemical transistors (OECTs). In the present study, we investigated the effect of linkage of diethylene glycol side chains in polythiophenes on the structure formation and orientation in thin films. Three polythiophenes in which the diethylene glycol side chain is either directly linked to the thiophene backbone (P3MEET) or attached via a methylene (P3MEEMT) or an ethylene (P3MEEET) spacer were investigated in bulk (DSC, WAXS) and in thin films on Si/SiO₂ (GIWAXS, AFM). As seen in DSC and WAXS measurements, the molecular order in the bulk significantly decreases with decreasing spacer length. In confirmation to this, a clear lamellar morphology is only visible in AFM measurements of thin films of P3MEEET. GIWAXS measurements show, that all samples have a strong preference for edge-on orientation in thin films. From these results we conclude, that the length of the alkyl spacer has a significant influence on the molecular order, but little influence on the orientation in thin films.