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Smart Responsive Azo-Copolymer with Photoliquefaction for Switchable Adhesive Application.

Ruiyang Zhao1, Jiahui Mu1, Jiayu Bai2

  • 1State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.

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Summary

Researchers developed a novel switchable adhesive using a photoresponsive azo-copolymer. This material offers reversible bonding and debonding, crucial for electronic device manufacturing and repair, with significantly enhanced adhesion strength.

Keywords:
azobenzenecopolymersphotoisomerizationsolid−liquid transitionswitchable adhesive

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Switchable adhesives are essential for electronics manufacturing and repair, addressing separation and recycling challenges.
  • Intelligent materials with controllable phase transitions offer tunable adhesion strengths for switchable applications.
  • Photoresponsive azobenzene derivatives enable photoinduced solid-liquid phase transitions due to isomer-dependent thermal properties.

Purpose of the Study:

  • To design and synthesize a novel three-component azo-copolymer (PNIM-Azo) exhibiting fast and reversible photoinduced solid-liquid phase transition.
  • To investigate the potential of PNIM-Azo as a high-strength switchable adhesive for electronic applications.

Main Methods:

  • Synthesis of a novel three-component azo-copolymer (PNIM-Azo).
  • Incorporation of 2-methoxyethyl acrylate and N-isopropylacrylamide to introduce heteroatoms (O and N).
  • Evaluation of photoinduced solid-liquid phase transition and adhesion strength of the synthesized copolymer.

Main Results:

  • The synthesized PNIM-Azo copolymer demonstrated reversible bonding and debonding processes triggered by photoinduced phase transitions.
  • The trans-configuration of PNIM-Azo exhibited the highest adhesion strength (∼11 MPa) among reported azobenzene-based switchable adhesives.
  • Enhanced adhesion strength is attributed to increased entanglement effects from H-bonds formed by heteroatoms in the polymer chains.

Conclusions:

  • PNIM-Azo provides a viable alternative for developing high-adhesion switchable adhesives.
  • The material's properties are suitable for applications in electronic production processes requiring controlled adhesion and release.