2053
Charge Transport and Structural Dynamics in Polymerized Ionic Liquids
According to classical theories, the self-diffusion and ion transport in electrolytes are controlled by structural relaxation. These approaches predict similar temperature dependence for the dc conductivity and structural dynamics. Although this prediction has been shown to hold reasonably well for low molecular weight aprotic ionic liquids [3], it fails for PolyILs [2]. In addition, the impact of morphology charge transport is not considered within the framework of these theories.
In this talk, new insights obtained from both experimental studies employing broadband dielectric spectroscopy, temperature-modulated differential scanning calorimetry, and scattering techniques along with multiscale modeling investigations to elucidate charge transport and structural dynamics in a systematic series of polymerized ammonium- and imidazolium- based ionic liquids will be presented. Detailed analyses reveal strong decoupling of these processes in the PolyILs, implying failure of the classical theories in describing charge transport and molecular dynamics in these materials. In addition, the strong correlation observed between ionic conductivity from dielectric experiments and morphologies from scattering studies will be discussed.
References
1) Mecerreyes, D. Progress in Polymer Science 2011, 36, 1629.
2) Sangoro, J. R. et al., Soft Matter 2014, 10, 3536.
3) Sangoro, J. R.; Kremer, F. Accounts of Chemical Research 2012, 45, 525; J. R. Sangoro, C. Iacob, A. Serghei, C. Friedrich, F. Kremer, Phys. Chem. Chem. Phys. 11, 913, (2009)