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Engineering an Advanced Ionogel by Modulation the Solvent/Network Interactions: High Strength, Ultra-Stretchability,

Hongyan Liu1, Aochen Yang1, Debin Wang1

  • 1School of Light Industry Science and Technology, Beijing Technology and Business University, Beijing, P. R. China.

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|June 18, 2026
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Summary

This study introduces a novel ionogel with high strength, self-healing, and tunable adhesion for flexible electronics. The material utilizes a binary solvent system for enhanced properties and performance.

Keywords:
flexible sensorionic hydrogelphysical cross‐linkingthermoresponsiveness

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Flexible Electronics

Background:

  • Ionogels are crucial for flexible electronics, offering stretchability, conductivity, and responsiveness.
  • Integrating high strength, self-healing, and controllable adhesion in ionogels remains a significant challenge.

Purpose of the Study:

  • To develop a single ionogel system with high mechanical strength, self-healing capability, and controllable adhesion.
  • To leverage a binary solvent strategy for enhanced material properties and performance in flexible devices.

Main Methods:

  • In-situ photopolymerization of NIPAM in a water/[EMIM][DCA] binary solvent system.
  • Utilizing water to modulate system polarity, broaden the Lower Critical Solution Temperature (LCST), and enhance dynamic crosslinking.
  • Characterization of mechanical properties, self-healing efficiency, adhesion, ionic conductivity, and performance as a strain sensor.

Main Results:

  • Achieved high strength (0.32 MPa) and ultrahigh stretchability (1872%) due to reversible physical crosslinks.
  • Demonstrated room-temperature self-healing with 98% stress recovery after 24 hours.
  • Exhibited thermally switchable adhesion (643 kPa on copper) and stable ionic conductivity (0.354 S/m).
  • The ionogel functioned as a sensitive strain sensor (GF = 2.09 at 400% strain) with excellent cycling stability.

Conclusions:

  • A binary solvent strategy effectively integrates multiple desirable properties into a single ionogel system.
  • The developed ionogel shows significant potential for advanced flexible electronics and wearable devices.
  • Dynamic physical crosslinking via polarity modulation is a viable approach for creating high-performance ionogels.