Ionic Conductivity through Thermoresponsive Polymer Gel: Ordering Matters

Thermoreversible polymer gel has been prepared using PEO–PPO–PEO block copolymer (Pluronic F77) which self-assembles into different microcrystalline phases like cubic, 2D-hexagonal, and lamellar. Addition of electrolyte (LiI/I2) converts the gel into a polymer gel electrolyte (PGE) which exhibits mi...

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Veröffentlicht in:Langmuir 2012-01, Vol.28 (1), p.751-756
Hauptverfasser: Soni, Saurabh S, Fadadu, Kishan B, Gibaud, Alain
Format: Artikel
Sprache:eng
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Zusammenfassung:Thermoreversible polymer gel has been prepared using PEO–PPO–PEO block copolymer (Pluronic F77) which self-assembles into different microcrystalline phases like cubic, 2D-hexagonal, and lamellar. Addition of electrolyte (LiI/I2) converts the gel into a polymer gel electrolyte (PGE) which exhibits microphase-dependent ionic conductivity. The crystalline phases have been identified by SAXS as a function of the polymer concentration. It is found that the optimum value for the ionic conductivity (≈1 × 10–3 S.cm–1) is achieved in the Im3m phase due to faster diffusion of ions through the 3D-interconnected micellar nanochannels. This fact is further supported by FTIR study, ionic transference number, and diffusion coefficient measurements.
ISSN:0743-7463
1520-5827
DOI:10.1021/la202670v