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Conductivity and Polarization Processes in Highly Cross-Linked Supported Ionic Liquid-Like Phases

AuthorsGarcia-Bernabé, Abel; Compan, Vicente; Burguete, M. Isabel ; García-Verdugo, Eduardo ; Karbass, Naima; Luis, Santiago V.; Riande, Evaristo
Issue Date2010
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C 114 : 7030–7037 (2010)
AbstractSupported ionic liquid-like phases were prepared by anchoring imidazolium moieties onto highly crosslinked poly(p-chloromethylstyrene-co-divinylbenzene) monolithic matrixes. The influence of the chemical nature of the anions on the response of supported ionic liquid-like phases to electrical perturbation fields was studied by impedance spectroscopy over wide ranges of frequency and temperature. The exchange of the chloride anions (Cl-) by bis(trifluormethanesulfonyl)amide anions (NTf2 -) greatly affects the psychic-chemical properties of the resulting material. The equivalent circuit that describes the impedance response of the SILLP materials used in this study to electrical perturbation fields is a resistance independent of frequency in series with a parallel Rp-CPE circuit. At high frequencies the CPE has the behavior of a capacitance. The ionic conductivity of the system increases 2 orders of magnitude by exchanging Cl- anions for NTf2 -. Despite the apparent high cross-linking degree of the supporter, the systems having imidazolium units with Cl- and NTf2 - as counterions apparently exhibit a glass-liquid transition in the vicinity of 343 K (70 °C) and 313 K (40 °C), respectively. Dipolar relaxations and conductive process are discussed in terms of chain mobility
Publisher version (URL)http://dx.doi.org/10.1021/jp910535z
Appears in Collections:(ICTP) Artículos
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