Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Charged Soft Matter, Polyelectrolytes and Ionic Liquids I

CPP 32.3: Talk

Wednesday, April 3, 2019, 10:00–10:15, H13

Inter- and Intramolecular Interactions in a Highly Conductive Polymeric Ionic Liquid — •Arthur Markus Anton, Falk Frenzel, and Friedrich Kremer — Peter Debye Institute for Soft Matter Physics

Polymeric ionic liquids (PILs) combine the advantages of neat ionic liquids with the mechanical benefits of polymers, which gives rise to the importance of those materials in supercapacitors, battery media, or gas separator membranes. Even though extensive research has been conducted driven by interest on the devices’ macroscopic performance, knowledge about molecular interactions is still not complete. Recently, it has been reported from a novel PIL which exhibits one of the highest values of DC-conductivity at temperatures below 100^∘C and – contrary to the common dogma – conductivity that does not decrease with rising degree of polymerization [F. Frenzel, R. Gutermann, A. M. Anton, J. Yuan, F. Kremer; Macromolecules, 50, (2017), 4022 – 4029].

In order to characterize this material further a set of experiments adapted to study inter- as well as intra-molecular interactions is examined. Temperature-dependent FTIR spectroscopy reveals extensive hydrogen bonding of particular moieties, whereas other parts are effectively screened. Temperature- and frequency-dependent broadband dielectric spectroscopy (BDS) confirms reduced charge transport (26 % reduction) in correlation with hydrogen bonding arising from hindered mobility. Moreover, in comparison to hydrogen bonding the influence of temperature-activated molecular mobility on the conductivity is considerably stronger (≈ 3 orders of magnitude).