SKM 2021 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Poster Session I

CPP 5.14: Poster

Dienstag, 28. September 2021, 17:30–19:30, P

Effect of chemical modification on crystal structure and thermal properties of Polydiketopyrrolopyrrole Copolymers — •Robert Kahl1, Gert Krauss2, Andreas Erhardt2, Oleksandr Dolynchuk1, Mukundan Thelakkat2, and Thomas Thurn-Albrecht11Experimental Polymer Physics, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle, Germany — 2Applied Functional Polymers, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany

Polydiketopyrrolopyrrole (PDPP) copolymers are second-generation semiconducting polymers that gained interest due to their superior performance in transistors and solar cells. Their chemical structure consisting of a DPP core with flanking units and/or co-monomers offers many opportunities to tune the optoelectronic properties by introducing chemical modifications. Here we investigated the thermal properties and crystal structure in bulk (DSC, TGA, WAXS) and in thin films (GIWAXS, AFM) of three PDPPs: PDPP[T]2{2-HD}2-T{DEG} (PDPP1) with thiophene flanking units and an additional OEG side chain, PDPP[Py]2{2-HD}2-T (PDPP2) with pyridine flanking units and PDPP[T]2{2-HD}2-T (PDPP3) with thiophene flanking units. PDPP3 shows only sanidic liquid crystalline order. PDPP1 shows crystalline order and a significantly lower melting temperature than PDPP2 and PDPP3. PDPP2 shows the most WAXS peaks, but has poor thermal stability. Our results demonstrate that thermal properties and ordering ability can be significantly influenced by introducing seemingly minor changes to the chemical structure of PDPPs.

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