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Enabling High Strength and Toughness Polyurethane through Disordered-Hydrogen Bonds for Printable, Recyclable,

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This study introduces a strong, recyclable polyurethane (SPPUs) for flexible electronics. The developed printable capacitive sensors (PCBS) offer a sustainable solution to electronic waste by enabling full material recovery.

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alcohol soluble recyclingdisordered‐hydrogen bondshigh strength and toughnesssensitive capacitive sensorsultra‐fast responsive

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Electronics

Background:

  • Rapid growth in smart, flexible electronics leads to significant electronic waste (e-waste).
  • Resource depletion and environmental pollution are major concerns associated with e-waste.
  • Development of recyclable materials is crucial for sustainable electronic devices.

Purpose of the Study:

  • To design and synthesize a novel, high-strength, and recyclable polyurethane (SPPUs).
  • To create SPPUs-nickel (Ni) composites for conductive and flexible electronic applications.
  • To develop printable capacitive sensors (PCBS) using these composites for sustainable electronics.

Main Methods:

  • Synthesis of a unique polyurethane (SPPUs) with exceptional mechanical properties (60 MPa strength, 360 MJ m⁻³ toughness).
  • Room-temperature recycling of SPPUs using ethanol as a green solvent.
  • Fabrication of SPPUs-Ni composites and screen-printing of printable capacitive sensors (PCBS) onto PET film and paper.

Main Results:

  • Achieved ultra-high strength and toughness in the synthesized SPPUs.
  • Demonstrated full recyclability of SPPUs and Ni powder at room temperature using ethanol.
  • Developed printable capacitive sensors (PCBS) with fast response time (~50 ms), high resolution, and multi-signal recognition.
  • Successfully combined flexibility, recyclability, and electrical conductivity in the SPPUs-Ni composites.

Conclusions:

  • The developed SPPUs offer a sustainable material solution for flexible electronics.
  • The printable capacitive sensors (PCBS) provide a pathway to reduce e-waste through complete material recycling.
  • This work presents a viable approach to address the environmental challenges posed by electronic waste in the field of recyclable flexible electronics.