Strong-Weak Response Network-Enabled Ionic Conductive Hydrogels with High Stretchability, Self-Healability, and...

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrochemistry

Background:

• Ionic conductive hydrogels are crucial for flexible electronics but often lack sufficient elasticity and mobility.
• Developing materials with both superelasticity and high ionic conductivity remains a significant challenge.

Purpose of the Study:

• To synthesize novel ionic conductive hydrogels with enhanced superelasticity and chain mobility.
• To investigate the structure-property relationships governing the mechanical and conductive behaviors of these hydrogels.

Main Methods:

• Free-radical copolymerization of 1-methyl-3-(4-vinylbenzyl)imidazolium chloride and sodium 2-acrylamido-2-methylpropanesulfonate.
• Characterization of hydrogel networks comprising strong electrostatic forces and weak hydrogen bonds.
• Tuning mechanical properties by adjusting counterion concentrations with inorganic salts.

Main Results:

• The synthesized hydrogels exhibited a strong-weak response network, providing high toughness (∼2205 kJ m⁻³) and fatigue resistance.
• Achieved excellent self-healing efficiency (>90%) and tunable mechanical strengths via counterion concentration.
• Demonstrated potential as stretchable ionic conductors for self-healable and self-adhesive ionic sensors.

Conclusions:

• The strong-weak response network design successfully integrates superelasticity and high chain mobility in ionic conductive hydrogels.
• This approach offers a promising strategy for manufacturing advanced ionic conductors for wearable and flexible electronic applications.