Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy
Complex electrical impedance and dielectric spectroscopy were applied to study the dielectric relaxations and their thermal behavior in ion-conducting composites/complexes from polymer poly(ethylene oxide) (PEO) and E8 nematic liquid crystals (LCs), at the compositional ratio PEO:E8 = 70:30 wt%. Fle...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/24/4465 |
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| author | Georgi B. Hadjichristov Todor E. Vlakhov Yordan G. Marinov Nicola Scaramuzza |
| author_facet | Georgi B. Hadjichristov Todor E. Vlakhov Yordan G. Marinov Nicola Scaramuzza |
| author_sort | Georgi B. Hadjichristov |
| collection | DOAJ |
| description | Complex electrical impedance and dielectric spectroscopy were applied to study the dielectric relaxations and their thermal behavior in ion-conducting composites/complexes from polymer poly(ethylene oxide) (PEO) and E8 nematic liquid crystals (LCs), at the compositional ratio PEO:E8 = 70:30 wt%. Flexible thin films of PEO/E8 with a thickness of 150 μm were inspected, as well as such films from Na<sup>+</sup> ion-conducting electrolyte PEO/E8/NaIO<sub>4</sub> with the same PEO:E8 compositional ratio, but additionally containing 10 wt.% from the salt sodium metaperiodate (NaIO<sub>4</sub>) as a dopant of Na<sup>+</sup> ions. The molecular dynamics, namely the dielectric relaxation of PEO/E8 and PEO/E8/NaIO<sub>4</sub>, were characterized through analyses of complex impedance and dielectric spectra measured in the frequency range of 1 Hz–1 MHz, under variation of temperature from below to above the glass-transition temperature of these composites. The relaxation and polarization of dipole formations in PEO/E8 and PEO/E8/NaIO<sub>4</sub> were evidenced and compared in terms of both electrical impedance and dielectric response depending on temperature. The results obtained for molecular organization, molecular relaxation dynamics, and electric polarization in the studied ion-conducting polymer/LC composites/complexes can be helpful in the optimization of their structure and performance, and are attractive for applications in flexible organic electronics, energy storage devices, and mechatronics. |
| first_indexed | 2024-03-10T03:14:32Z |
| format | Article |
| id | doaj.art-6b7905a4cbf64bc9bd008238451a75f7 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T03:14:32Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-6b7905a4cbf64bc9bd008238451a75f72023-11-23T10:16:45ZengMDPI AGPolymers2073-43602021-12-011324446510.3390/polym13244465Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation SpectroscopyGeorgi B. Hadjichristov0Todor E. Vlakhov1Yordan G. Marinov2Nicola Scaramuzza3Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, BulgariaGeorgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, BulgariaGeorgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, BulgariaDipartimento di Fisica, Università degli Studi della Calabria (UNICAL), Via P. Bucci, Cubo 33B, 87036 Rende, ItalyComplex electrical impedance and dielectric spectroscopy were applied to study the dielectric relaxations and their thermal behavior in ion-conducting composites/complexes from polymer poly(ethylene oxide) (PEO) and E8 nematic liquid crystals (LCs), at the compositional ratio PEO:E8 = 70:30 wt%. Flexible thin films of PEO/E8 with a thickness of 150 μm were inspected, as well as such films from Na<sup>+</sup> ion-conducting electrolyte PEO/E8/NaIO<sub>4</sub> with the same PEO:E8 compositional ratio, but additionally containing 10 wt.% from the salt sodium metaperiodate (NaIO<sub>4</sub>) as a dopant of Na<sup>+</sup> ions. The molecular dynamics, namely the dielectric relaxation of PEO/E8 and PEO/E8/NaIO<sub>4</sub>, were characterized through analyses of complex impedance and dielectric spectra measured in the frequency range of 1 Hz–1 MHz, under variation of temperature from below to above the glass-transition temperature of these composites. The relaxation and polarization of dipole formations in PEO/E8 and PEO/E8/NaIO<sub>4</sub> were evidenced and compared in terms of both electrical impedance and dielectric response depending on temperature. The results obtained for molecular organization, molecular relaxation dynamics, and electric polarization in the studied ion-conducting polymer/LC composites/complexes can be helpful in the optimization of their structure and performance, and are attractive for applications in flexible organic electronics, energy storage devices, and mechatronics.https://www.mdpi.com/2073-4360/13/24/4465polymer–liquid crystal compositeselectrolytesalkali metal ion-polymer complexeselectrical propertiesionic conductivitydielectric properties |
| spellingShingle | Georgi B. Hadjichristov Todor E. Vlakhov Yordan G. Marinov Nicola Scaramuzza Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy Polymers polymer–liquid crystal composites electrolytes alkali metal ion-polymer complexes electrical properties ionic conductivity dielectric properties |
| title | Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy |
| title_full | Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy |
| title_fullStr | Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy |
| title_full_unstemmed | Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy |
| title_short | Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy |
| title_sort | ion conducting flexible thin films of composites from poly ethylene oxide and nematic liquid crystals e8 characterization by impedance and dielectric relaxation spectroscopy |
| topic | polymer–liquid crystal composites electrolytes alkali metal ion-polymer complexes electrical properties ionic conductivity dielectric properties |
| url | https://www.mdpi.com/2073-4360/13/24/4465 |
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