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Adhesion

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...

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Bioinspired Adhesives with Debonding-on-Demand Capability.

Athanasios Skandalis¹, Mathieu A Ayer², Christoph Weder¹

¹Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland.

ACS Macro Letters

|March 18, 2025

Summary

New debonding-on-demand (DoD) adhesives inspired by shellac offer high strength and reusability. These novel adhesives, based on linear oligomers, overcome limitations of previous supramolecular options for improved manufacturing and recycling.

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Area of Science:

Materials Science
Polymer Chemistry
Adhesion Science

Background:

Debonding-on-demand (DoD) adhesives offer benefits in manufacturing, product lifecycle, and recycling.
Current supramolecular adhesives have limited adhesive strength and complex synthesis.
Natural resin shellac serves as an inspiration for advanced adhesive design.

Purpose of the Study:

To develop novel DoD adhesives with enhanced adhesive strength and simplified processing.
To explore linear oligomers of bisphenol A diglycidyl ether and secondary diamines for adhesive applications.
To overcome the limitations of existing supramolecular adhesives.

Main Methods:

Synthesis of linear oligomers based on bisphenol A diglycidyl ether and secondary diamines.
Controlled molecular weight to achieve solubility and melt-processability.
Lap shear adhesion tests on stainless steel substrates.
Thermal analysis to determine glass transition temperature for debonding.

Main Results:

Achieved shear strengths ranging from 3.5-16 MPa, exceeding shellac and previous supramolecular adhesives.
Demonstrated successful debonding upon heating above the glass transition temperature.
Confirmed reusability of the adhesive joints without loss of strength.

Conclusions:

A new family of DoD adhesives based on linear oligomers offers superior performance compared to existing supramolecular adhesives.
These adhesives are melt-processable, highly soluble, and exhibit excellent bond strength and reusability.
The findings pave the way for more sustainable and efficient adhesive applications in various industries.