Conductivity and Polarization Processes in Highly Cross-Linked Supported Ionic Liquid-Like Phases
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http://dx.doi.org/10.1021/jp910535z |
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Conductivity and Polarization Processes in Highly Cross-Linked Supported Ionic Liquid-Like PhasesAutoria
Data de publicació
2010Editor
American Chemical SocietyISSN
1932-7447Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.acs.org/doi/abs/10.1021/jp910535zParaules clau / Matèries
Resum
Supported ionic liquid-like phases were prepared by anchoring imidazolium moieties onto highly cross-linked poly(p-chloromethylstyrene-co-divinylbenzene) monolithic matrixes. The influence of the chemical nature of ... [+]
Supported ionic liquid-like phases were prepared by anchoring imidazolium moieties onto highly cross-linked 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. [-]
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