Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.70: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Investigation of Crystal Structure of Polydiketopyrrolopyrrole Copolymers — •Robert Kahl1, Gert Krauss2, Andreas Erhardt2, Oleksandr Dolynchuk1, Mukundan Thelakkat2, and Thomas Thurn-Albrecht1 — 1Experimental Polymer Physics, Martin Luther University Halle-Wittenberg — 2Applied Functional Polymers, University of Bayreuth
Polydiketopyrrolopyrrole (PDPP) copolymers are promising materials for applications in organic solar cells and transistors. Their chemical structure offers many possibilities for modifications, allowing to adjust their optoelectronic properties according to the desired application. Here, we investigated the molecular ordering and thermal properties in bulk (WAXS, DSC, TGA) and in thin films (GIWAXS, AFM) of three exemplary PDPPs, two donor polymers: PDPP[T]2{2-HD}2- T (PDPPT) with thiophene flanking units and PDPP[T]2{2-HD}2- T{DEG} (PDPPT−OEG) with thiophene flanking units and an additional OEG side chain, and one acceptor polymer: PDPP[Py]2{2- HD}2-T (PDPPPy) with pyridine flanking units. In the ordered state, all three PDPPs show regular π-π-stacked backbones (d020 = 3.7 - 3.9 Å) and a regular layered structure of demixed backbones and side chains (d100 = 18.7 - 19.1 Å). While PDPPT and PDPPT−OEG only have sanidic liquid crystalline order, PDPPPy has a complex triclinic structure. PDPPT−OEG has the lowest melting temperature and PDPPPy the poorest thermal stability of the three. These results demonstrate the significant influence of seemingly small chemical modifications on crystal structure and thermal properties of PDPPs.