4.7 Article

Waterborne Polyurethane Enhanced, Adhesive, and Ionic Conductive Hydrogel for Multifunctional Sensors

Journal

MACROMOLECULAR RAPID COMMUNICATIONS
Volume 42, Issue 22, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202100457

Keywords

adhesive; biocompatibility; hydrogels; ionic conductivity; strechability; wearable sensors

Funding

  1. Guangzhou Science and Technology Planning Project, China [202002030305]
  2. Chongqing Technology Innovation and Application Development Project, China [cstc2020jscx-msxm0339]
  3. Regional key project of the Science and Technology Services Network Program (STS) of the CAS [KFJ-STS-QYZX-089]

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A novel zwitterionic composite hydrogel with high mechanical strength, satisfactory ionic conductivity, and broad adhesion capabilities has been developed, showing synergistic enhancement of mechanical strength and ionic conductivity through the combination of waterborne polyurethanes (PU) and poly(sulfobetaine zwitterion-co-acrylamide) (SAm); The hydrogel-based strain/stress sensor exhibits high sensitivity, wide sensing range, great stability, and accuracy for human body movements detecting and voice recognition, promoting the development of wearable devices.
In the past two decades, ionic conductive hydrogel has attracted tremendous research interests for their intrinsic characteristics in the field of flexible sensor. However, synchronous achievement of high mechanical strength, satisfied ionic conductivity, and broad adhesion to various substrates is still a challenge. Herein, a novel zwitterionic composite hydrogel that displayed excited strechability (up to 900%), satisfied strength (about 30 kPa), high ionic conductivity (1.2 mS cm(-1)), and adhesion to polar and nonpolar materials is fabricated though the combination of waterborne polyurethanes (PU) and poly(sulfobetaine zwitterion-co-acrylamide) (SAm). Especially, this facile strategy demonstrates that PU has a synergistic effect on enhancing mechanical strength and ionic conductivity for ionic conductive hydrogel. Moreover, the hydrogel-based strain/stress sensor shows high sensitivity, wide sensing range, great stability, and accuracy for human body movements detecting and voice recognition. This novel ionic conductive hydrogel has promoted the development of wearable devices.

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