Tough, self-healing polyurethane with novel functionality for fully recoverable layered sensor arrays

Somin Kim, Jung Wook Kim, Yong Hui Lee, Yu Ra Jeong, Kayeon Keum, Dong Sik Kim, Hanchan Lee, Jeong Sook Ha

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Although extensive effort has been made on developing self-healing materials with superior durability, there still remain considerable limits in materials and processes for acquiring fully self-healing integrated electronic devices. We report on the synthesis of novel oxime-carbamate bond-based polyurethane (OC-PU) and its application to fully self-healing integrated sensor arrays, regardless of the damaged direction. Synthesized OC-PU showed highly stretchable, hydrophobic, highly chemically resistant, and thermo-selectively self-healable properties, with elaborately optimizing soft segments of PDMS and trifunctional crosslinker diethylenetriamine. OC-PU exhibited superior mechanical properties with elongation at break of 1076 %, Young's modulus of 1.2 MPa, and an excellent self-healing efficiency of 93.7 % when heated at 65 ℃. Based on novel OC-PU, a self-healing capacitive pressure sensor assembling OC-PU/galinstan/Ni composite electrodes and OC-PU dielectric film through self-healing process. The fabricated sensor could detect body motions with stable operation in water, and also could recover sensitivity after repetitive self-healing from a complete bisection. Furthermore, a fully self-healing stretchable array of pressure sensors with layered structure is fabricated via photolithography using galinstan interconnections selective wet onto patterned Au grid lines. This work suggests a high potential application of our self-healing polyurethane with novel functionality to developing fully self-healing integrated wearable devices.

Original languageEnglish
Article number142700
JournalChemical Engineering Journal
Publication statusPublished - 2023 May 15

Bibliographical note

Funding Information:
S. Kim and J. W. Kim equally contributed to this work. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (Grant No. NRF-2022R1A4A1031687 and NRF-2022R1A2C2092575). It was also supported by a Korea University Grant.

Publisher Copyright:
© 2023 Elsevier B.V.


  • Fully self-healing pressure sensor array
  • Oxime-carbamate bond
  • Photolithography patterning
  • Self-healing electronics
  • Thermo-selective self-healing polyurethane

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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