Molecular relaxation and ionic conductivity of ionic liquids confined in apoly(vinylidenefluoride) polymer matrix: Influence of anion and cation type
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Otros documentos de la autoría: Correia, D. M.; Costa, C. M.; Sabater i Serra, Roser; Gómez Tejedor, J. A.; Teruel Biosca, L.; De Zea Bermúdez, Verónica; Esperança, J. M. S. S.; Reis, P. M.; Andrio, Andreu; Meseguer-Dueñas, J. M.; lanceros-mendez, senentxu; Gomez Ribelles, Jose Luis
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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https://doi.org/10.1016/j.polymer.2019.03.032 |
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Título
Molecular relaxation and ionic conductivity of ionic liquids confined in apoly(vinylidenefluoride) polymer matrix: Influence of anion and cation typeAutoría
Fecha de publicación
2019Editor
ElsevierISSN
0032-3861Cita bibliográfica
CORREIA, D. M., et al. Molecular relaxation and ionic conductivity of ionic liquids confined in a poly (vinylidene fluoride) polymer matrix: Influence of anion and cation type. Polymer, 2019, vol. 171, p. 58-69.Tipo de documento
info:eu-repo/semantics/bookVersión de la editorial
https://www.sciencedirect.com/science/article/pii/S0032386119302538Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Blends of poly(vinylidenefluoride) (PVDF) and ionic liquids (ILs) with different cations and anions have beenprepared by solvent casting. The IL content was the same in all blends of the series. Molecular relaxation ... [+]
Blends of poly(vinylidenefluoride) (PVDF) and ionic liquids (ILs) with different cations and anions have beenprepared by solvent casting. The IL content was the same in all blends of the series. Molecular relaxation andionic conductivity have been systematically studied by broadband dielectric relaxation spectroscopy (BDS) inwide frequency (0.1 Hz–1 MHz) and temperature ranges (−120 to 150 °C) and the results have been analysed interms of dielectric modulus M*(ω) and conductivityσ*(ω) formalisms. The main relaxation process (β-relaxa-tion) of the amorphous phase of the blend that integrates amorphous polymer chain segments and IL moleculeswas observed. Significant differences in the Vogel-Fulcher-Tammann (VFT)fitting parameters in the PVDF/ILblends with different anions were detected. The conductivityσ*(ω) formalism shows that it is strongly depen-dent on the miscibility of the IL with the amorphous PVDF chains and the type of anion. The Barton-Namikawa-Nakajima (BNN) relationσ0∼ωcis fulfilled for all PVDF/IL blends except for that containing 1-ethyl-3- me-thylimidazolium hydrogen sulfate, [Emim][HSO4]. The activation energy of theacconductivity, calculatedaccording to the Dyre model, decreases for all PVDF/IL blends with respect to neat PVDF. The structure of thecation of the IL has been found to exert less influence on the dielectric and conductivity properties of the blends. [-]
Publicado en
Polymer, Volume 171, 2019.Proyecto de investigación
UID/FIS/04650/2013 ; PTDC/CTM-ENE/5387/2014 ; PTDC/EEI-SII/5582/2014 ; PTDC/FIS-MAC/28157/2017 ; SFRH/BPD/121526/2016 ; SFRH/BPD/112547/2015 ; IF/00355/2012 ; IF/0621/2015 ; MAT2016-76039-C4-1-R ; MAT2016-76039-C4-3-R ; UID/QUI/50006/2013 ; POCI-01-0145-FEDER-007265 ; PIBA-2018-06Derechos de acceso
0032-3861/ © 2019 Elsevier Ltd. All rights reserved.
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