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Water-Debondable Adhesive Polymer Networks Using Hyperbranched Polyglycerols.

Motoharu Shoda1,2, Naroa Sadaba1, S Cem Millik1

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|October 6, 2025
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New water-debondable adhesives based on hyperbranched polyglycerols (HPGs) offer strong adhesion and easy removal with water. These sustainable adhesives avoid harsh conditions and residue, simplifying manufacturing processes.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Manufacturing

Background:

  • Debondable adhesives are crucial for automotive and electronics, but conventional options require harsh removal conditions and leave residue.
  • Limitations include difficult debonding processes and post-removal cleaning, hindering sustainable manufacturing.

Purpose of the Study:

  • To develop novel water-debondable adhesives with high adhesion strength and simple debonding mechanisms.
  • To explore polyester-cross-linked hyperbranched polyglycerols (HPGs) as precursors for advanced adhesives.

Main Methods:

  • Synthesized polyester-cross-linked HPGs and characterized their properties, including hydroxyl functionality, glass transition temperature (Tg), and viscosity.
  • Formulated adhesives using HPGs and pyromellitic dianhydride (PMDA), followed by thermal curing to bond aluminum substrates.

Main Results:

  • The developed HPG-based adhesives demonstrated adhesion strength more than double that of a commercial epoxy adhesive.
  • High adhesion was maintained for 3 days under ambient conditions.
  • Debonding was achieved simply by immersing the adhered samples in 90 °C water.

Conclusions:

  • Polyester-cross-linked HPGs provide a viable platform for creating high-strength, water-debondable adhesives.
  • These adhesives offer a sustainable alternative to conventional bonding methods, simplifying manufacturing and reducing waste.
  • The reversible hydrogen bonding in HPGs contributes to both strong adhesion and facile debonding.