Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Ionic Liquids and Water
CPP 33.5: Vortrag
Mittwoch, 9. März 2016, 10:45–11:00, H40
Charge tranport and molecular dynamics in Polymeric Ionic Liquids — •Falk Frenzel1, Makafui Folikumah2, Matthias Schulz2, Markus Anton1, Wolfgang Binder2, and Friedrich Kremer1 — 1Universität Leipzig, Leipzig, Deutschland — 2Martin-Luther Universität Halle-Wittenberg, Halle (Saale), Deutschland
Polymeric Ionic Liquids (PIL) are synthesised by incorporating into telechelic Polyisobutylene (PIB)-based Ionic Liquid (IL)-like monovalent and bivalent cations of either N,N,N-triethylammonium or 1-methylpyrrolidinium with Br, NTf2, OTf and pTOS as anions. In total a homologous series of 16 PILs is studied. Charge transport, molecular dynamics and the microscopic structural arrangement are analyzed over a wide frequency (1E-2 - 1E7Hz)and temperature (200 - 400K) range by means of Broadband Dielectric Spectroscopy (BDS), Transmission Electron Microscopy (TEM) and Differential Scanning Calorimetry (DSC). Three relaxtion processes are observed: (i) the dynamic glass transition of the polymeric matrix, (ii) a conductivity relaxation originating from charge transport within IL-like moieties and (iii) a Debye-process tentatively caused by H-bonding-assembly; and in addition a weak electrode polarisation. The net conductivity of the PIL as a whole is quantitatively described by an Effective-Medium approach reflecting the microphase-separated character of the PIL under study.