A Highly Ionic Conductive, Healable, and Adhesive Polysiloxane-Supported Ionogel.

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrochemistry

Background:

• Ionic liquids (ILs) are promising electrolytes but often suffer from leakage issues.
• Developing stable, self-healing ionogels is crucial for advanced electronic applications.
• Polysiloxane-based materials offer unique properties for ionogel matrices.

Purpose of the Study:

• To design and synthesize a novel polysiloxane-supported ionogel with enhanced properties.
• To investigate the self-healing capabilities and ionic conductivity of the new material.
• To evaluate the ionogel's performance in flexible electronic devices, particularly at low temperatures.

Main Methods:

• Ionic liquids, specifically 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][Tf2N]), were locked into a poly(aminopropyl-methylsiloxane) (PAPMS) matrix grafted with [2-(methacryloyloxy)ethyl] trimethylammonium chloride (METAC).
• Tannic acid (TA) was used to create a dual-crosslinked network through hydrogen bonding and ionic aggregation.
• Mechanical properties, ionic conductivity, self-healing efficiency, adhesion, and performance at subzero temperatures were characterized.

Main Results:

• The ionogel demonstrated good mechanical strength and recovery properties.
• High ionic conductivity of 1.19 mS cm⁻¹ was achieved at 25 °C.
• Excellent self-healing ability (≈83% healing in 12 h) was observed due to the dual-crosslinked network.
• Satisfactory adhesive behavior and stable performance at subzero temperatures were confirmed.

Conclusions:

• A novel, self-healing, conductive polysiloxane-supported ionogel was successfully developed.
• The material's robust mechanical properties, ionic conductivity, and self-healing ability make it suitable for flexible electronics.
• Its performance at low temperatures opens possibilities for applications in extreme environments, such as sensors and supercapacitors.