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Thermal Scanning Conductometry (TSC) as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels

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Ionic conductivity through thermoresponsive polymer gel: ordering matters.

Saurabh S Soni¹, Kishan B Fadadu, Alain Gibaud

¹Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar-388 120, Gujarat, India. soni_b21@yahoo.co.in

Langmuir : the ACS Journal of Surfaces and Colloids

|November 11, 2011

Summary

This study developed a polymer gel electrolyte using Pluronic F77, finding optimal ionic conductivity in the Im3m phase due to enhanced ion diffusion through its unique structure.

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Area of Science:

Materials Science
Polymer Chemistry
Electrochemistry

Background:

Thermoreversible polymer gels are formed by self-assembly of block copolymers like PEO-PPO-PEO (Pluronic F77).
These gels can transition into polymer gel electrolytes (PGEs) upon electrolyte addition, influencing ionic conductivity.
The microcrystalline phases formed by the block copolymer impact the material's properties.

Purpose of the Study:

To investigate the relationship between the microcrystalline phases of a Pluronic F77-based thermoreversible polymer gel and its ionic conductivity.
To identify the optimal phase for achieving high ionic conductivity in polymer gel electrolytes.
To understand the mechanism behind the enhanced ionic transport in specific phases.

Main Methods:

Preparation of thermoreversible polymer gels using PEO-PPO-PEO (Pluronic F77).
Conversion of gels to polymer gel electrolytes (PGEs) with LiI/I(2) electrolyte.
Small-angle X-ray scattering (SAXS) to identify crystalline phases based on polymer concentration.
Characterization of ionic conductivity, FTIR, ionic transference number, and diffusion coefficients.

Main Results:

Pluronic F77 self-assembles into cubic, 2D-hexagonal, and lamellar microcrystalline phases.
Ionic conductivity is dependent on the microphase structure of the PGE.
The Im3m phase exhibited the highest ionic conductivity (approximately 1 × 10(-3) S cm(-1)).
Enhanced ion diffusion in the 3D-interconnected micellar nanochannels of the Im3m phase was observed.

Conclusions:

The Im3m phase of the Pluronic F77-based polymer gel electrolyte provides optimal conditions for ionic transport.
The unique 3D-interconnected nanochannel structure facilitates faster ion diffusion, leading to higher conductivity.
This research highlights the importance of microphase control for developing efficient polymer gel electrolytes.