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Stimuli-Responsive Reversible Two-Level Adhesion from a Structurally Dynamic Shape-Memory Polymer.

Brian T Michal1, Emily J Spencer1,2, Stuart J Rowan1

  • 1Department of Macromolecular Science and Engineering, Case Western Reserve University , 2100 Adelbert Road, Cleveland, Ohio 44106-7202, United States.

ACS Applied Materials & Interfaces
|April 21, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel shape-memory adhesive with two reversible adhesion levels. Its dynamic disulfide bonds and semicrystalline structure enable tunable adhesion and repositionable joints upon heating.

Keywords:
adhesivedisulfidesdynamic networkreversibleshape memory

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Area of Science:

  • Polymer Science
  • Materials Science
  • Adhesion Science

Background:

  • Developing advanced adhesives with tunable properties is crucial for modern engineering applications.
  • Shape-memory materials offer unique functionalities, including reversible deformation and self-healing capabilities.
  • Dynamic covalent bonds provide opportunities for creating responsive and recyclable polymer networks.

Purpose of the Study:

  • To synthesize and characterize a novel shape-memory adhesive with dual-stage reversible adhesion.
  • To investigate the mechanism underlying the tunable adhesive properties based on material's thermal and photochemical responses.
  • To demonstrate the utility of the adhesive in creating repositionable joints.

Main Methods:

  • Synthesis of a semicrystalline cross-linked polymer incorporating dynamic disulfide bonds.
  • Characterization of adhesive properties through mechanical testing, surface analysis, and thermal/photochemical stimulus response.
  • Evaluation of adhesion strength and reversibility on various substrates under different conditions.

Main Results:

  • The adhesive demonstrated two distinct levels of reversible adhesion controlled by temperature and UV light.
  • Melting crystalline regions enhanced initial wetting and contact, forming the primary adhesive bond.
  • Disulfide bond exchange at higher temperatures or UV exposure further reduced modulus, improving wetting and strengthening the bond.
  • The material exhibited shape-memory behavior, enabling repositioning of bonded joints upon heating.

Conclusions:

  • A novel shape-memory adhesive with tunable, reversible adhesion has been successfully developed.
  • The dual-stage adhesion mechanism, driven by crystalline melting and disulfide bond dynamics, offers precise control over bonding.
  • The material's shape-memory effect allows for the creation of reconfigurable adhesive joints, expanding its application potential.