Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Glasses and Glass Transition (joint session CPP/DY)

CPP 16.2: Vortrag

Montag, 1. April 2019, 16:30–16:45, H8

Molecular Dynamics of Dipole Functionalized Triphenylene-based Discotics — •Arda Yildirim¹, Andrea Bühlmeyer², Shunsuke Hayashi³, Johannes Christian Haenle², Kathrin Sentker⁴, Patrick Huber⁴, Sabine Laschat², and Andreas Schönhals¹ — ¹Bundesanstalt für Materialforschung und *prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany — ²Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany — ³Department of Applied Chemistry, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan — ⁴Materials Physics and Technology, Hamburg University of Technology (TUHH), 21073 Hamburg, Germany

In this study, the molecular dynamics of a series of dipole functionalized triphenylene-based discotics, forming a columnar mesophase, were investigated by broadband dielectric spectroscopy (BDS). In addition to conductivity and localized dynamics, glassy dynamics were also observed. At higher temperatures an α1-processes and at low temperatures an α2 processes were detected having a completely different temperature dependence of its relaxation times. Different molecular assignments of α1- and α2-processes are suggested. The phase behavior of the material was explored under helium purge down to 100 K by differential scanning calorimetry (DSC). Besides the phase transition temperatures and enthalpies, one or two thermal glass transitions were found for all the materials. Moreover, the glassy dynamics were further investigated by Flash DSC, which is a chip-based calorimetry technique allowing for fast heating and cooling rates as high as 10000K