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Exploring Self-Healing and Switchable Adhesives based on Multi-Level Dynamic Stable Structure.

Hualiang Xu1, Shiwei Zhao1, Anqian Yuan1

  • 1State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 17, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed novel switchable adhesives (CIPUs:Cu2+) with strong adhesion and rapid switching capabilities. These multifunctional materials exhibit self-healing properties and dynamic bonding for advanced applications.

Keywords:
metal-ligand bondsmulti-level dynamic stable structureson-demand bondingself-healingswitchable adhesives

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Adhesion Science

Background:

  • Developing adhesives with both strong adhesion and switchable properties presents a significant challenge.
  • Existing adhesives often compromise one property for the other, limiting their application scope.

Purpose of the Study:

  • To engineer multifunctional switchable adhesives with enhanced adhesion, rapid switching, and self-healing capabilities.
  • To investigate the underlying mechanism of dynamic bonding in these novel adhesive systems.

Main Methods:

  • Synthesized copper(II) ion (Cu2+) cross-linked polyurethane incorporating curcumin and imidazole derivatives.
  • Characterized adhesive properties including adhesion strength, switching speed, and efficiency.
  • Utilized density functional theory (DFT) to analyze the metal-ligand bonding structure and behavior.

Main Results:

  • Achieved strong adhesion (up to 2.46 MPa) on diverse surfaces, inspired by mussel adhesive proteins.
  • Demonstrated fast switching speeds (30 s) and high efficiency via contactless remote stimulations.
  • DFT revealed a multi-level dynamic structure formed by Cu2+-curcumin and Cu2+-imidazole complexes, enabling reversible network reconstruction and energy dissipation.
  • Observed intrinsic self-healing at room temperature without external stimuli.

Conclusions:

  • The developed Cu2+-curcumin-imidazole-polyurethane (CIPUs:Cu2+) system offers a promising platform for advanced switchable adhesives.
  • The unique multi-level dynamic bonding strategy enhances both adhesive strength and switchability.
  • Potential applications include intelligent gadgets and wearable bio-monitoring devices.