Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.40: Poster
Montag, 12. März 2018, 17:30–19:30, Poster A
Multi-Phase Transition Behavior of Highly Conductive Polybromide Ionic Liquids — •Falk Frenzel1, Karsten Sonnenberg2, Sebastian Hasenstab-Riedel2, and Friedrich Kremer1 — 1Universität Leipzig, Leipzig, Germany — 2Freie Universität Berlin, Berlin, Germany
Over the last three decades Ionic Liquids (ILs) have reached such a remarkable scientific interest that nowadays this class of materials comprise a million dollar market being commercially used in application areas like medicine, energy technology and synthetic chemistry. Even though most scientific questions for 'standard' ILs have been addressed and already answered the novel subclass of (poly) halogenide Ionic Liquids opens the window to unique properties like multiple phase transitions. In order to study them as well as the molecular dynamics and charge transport mechanism X-ray scattering, broadband dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC) have been employed to six different samples consisting of asymmetrical ammonium cations in composition with tribromide respectively nonabromide anions. The current study unravels three molecular relaxation processes, whereat one is assigned to the dynamic glass transition (DGT) while the other both are secondary relaxations, as well as the primarily charge transport mechanism that is determined to be a DGT assisted hopping process. Furthermore, the at room temperature remarkably high DC-conductivity ( >10 mS/cm) is strongly dependent on the thermally history below 300K due to distinct hystereses of the phase transitions.