Self-Healable Elastomeric Network with Dynamic Disulfide, Imine, and Hydrogen Bonds for Flexible Strain Sensor

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Flexible electronics require robust and stable materials.
• Self-healable elastomers are crucial for device longevity and performance.
• Strain sensors are key components in wearable and soft electronic systems.

Purpose of the Study:

• To develop a self-healable and stretchable elastomer-based strain sensor.
• To integrate carbon nanotubes (CNTs) as a conductive component.
• To evaluate the self-healing, mechanical, and sensing properties of the fabricated sensor.

Main Methods:

• Synthesized a self-repairable crosslinked elastomer (PIH2T1-tri) with disulfide, imine, and hydrogen bonds.
• Incorporated carbon nanotubes (CNTs) into the elastomer to create the PIH2T1-tri/CNT-3 sensor.
• Characterized the material's self-healing efficiency, mechanical integrity (elongation at break, tensile strength, Young's modulus), electrical conductivity, and sensing performance (sensitivity, response time, durability).

Main Results:

• The PIH2T1-tri elastomer exhibited high self-healing efficiency (91%) and good mechanical properties (672% elongation at break, 1.41 MPa tensile strength).
• The PIH2T1-tri/CNT-3 sensor demonstrated effective self-healing of electrical conduction and sensing capabilities.
• The sensor achieved high sensitivity (gauge factor = 24.1), a short response time (120 ms), and long-term durability (4000 cycles).

Conclusions:

• A novel self-healable elastomer platform with carbon-based conductive components was successfully developed.
• The PIH2T1-tri/CNT-3 sensor shows significant potential for high-performance soft electronics applications.
• The material's combination of self-healing and reliable sensing performance addresses key challenges in flexible electronics.