Ductile adhesive elastomers with force-triggered ultra-high adhesion strength.

Area of Science:

• Materials Science
• Polymer Chemistry

Background:

• Elastomers are crucial for advanced technologies, with adhesive properties dictating interface performance.
• Conventional permanent adhesives face challenges like premature sticking and poor contact, limiting their application.
• Existing triggered adhesion methods (UV, heat) are impractical in many scenarios requiring external sources.

Purpose of the Study:

• To develop a novel, ready-to-use adhesive elastomer with on-demand adhesion.
• To overcome limitations of conventional permanent and externally triggered adhesives.
• To enable controlled installation and curing processes for enhanced material performance.

Main Methods:

• Formulation of a precursor comprising a capsule-separated, two-component curing system.
• Application of a compression force to trigger adhesion and initiate the curing process.
• Characterization of the cured elastomer's adhesive properties, including peel and lap shear strength.

Main Results:

• The novel elastomer exhibits on-demand adhesion triggered by compression force.
• Achieved ultra-high strength with a peel strength of 1.2 × 10^4 N m^-1 and lap shear strength of 7.8 × 10^3 kPa.
• Adhesion attributed to excellent surface contact of the liquid-like precursor and a reinforced two-phase design in the cured elastomer.

Conclusions:

• The developed elastomer provides on-demand adhesion, overcoming limitations of permanent adhesives.
• The compression-triggered system allows controlled delay between installation and curing, optimizing processes.
• This technology reduces energy costs, prevents failures, and improves installation in advanced material applications.