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Waterborne Polyurethane Enhanced, Adhesive, and Ionic Conductive Hydrogel for Multifunctional Sensors
Xiaobin Li1,2, Ending Zhang1,2,3, Jun Shi1,2,4
1Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, 510650, P. R. China.
Macromolecular Rapid Communications
|October 14, 2021
Summary
Researchers developed a novel zwitterionic composite hydrogel with high stretchability, strength, and ionic conductivity. This advanced material shows promise for flexible sensors and wearable devices.
Area of Science:
- Materials Science
- Polymer Chemistry
Background:
- Ionic conductive hydrogels are crucial for flexible sensors.
- Achieving high mechanical strength, ionic conductivity, and adhesion simultaneously remains a challenge.
Purpose of the Study:
- To fabricate a novel zwitterionic composite hydrogel with enhanced properties.
- To investigate the synergistic effects of waterborne polyurethanes (PU) and poly(sulfobetaine zwitterion-co-acrylamide) (SAm).
Main Methods:
- Fabrication of a composite hydrogel by combining PU and SAm.
- Characterization of the hydrogel's mechanical strength, ionic conductivity, and adhesion properties.
- Fabrication and testing of a hydrogel-based strain/stress sensor.
Main Results:
- The composite hydrogel exhibited high stretchability (900%), strength (30 kPa), and ionic conductivity (1.2 mS cm⁻¹).
- The hydrogel demonstrated adhesion to both polar and nonpolar materials.
- The sensor showed high sensitivity, wide sensing range, stability, and accuracy for detecting human body movements and voice.
Conclusions:
- The developed zwitterionic composite hydrogel offers a promising solution for flexible sensors.
- The combination of PU and SAm synergistically enhances mechanical and conductive properties.
- This material significantly advances the development of wearable devices.
