Mechanically Interlocked [an]Daisy Chain Adhesives with Simultaneously Enhanced Interfacial Adhesion and Cohesion

Area of Science:

• Materials Science
• Polymer Chemistry
• Supramolecular Chemistry

Background:

• Developing robust adhesives with balanced adhesive and cohesive properties is a persistent challenge.
• Traditional adhesives often struggle to maintain performance under varying conditions.
• Mechanical bonds and hydrogen bonding are known to enhance material properties.

Purpose of the Study:

• To design and prepare a novel robust adhesive using mechanically interlocked structures and hydrogen bonding.
• To investigate the synergistic effects of mechanical bonds and hydrogen bonding on adhesive performance.
• To understand the structure-property relationships in advanced adhesive materials.

Main Methods:

• Synthesis of a mechanically interlocked [an]daisy chain network (DC-MIN) adhesive.
• Orthogonal integration of mechanical bonds and 2-ureido-4[1H]-pyrimidone (UPy) hydrogen bonding.
• Comparative analysis with control materials lacking the interlocked structure.

Main Results:

• The DC-MIN adhesive demonstrated robust mechanical properties and strong interfacial bonding.
• The UPy moiety facilitated network formation and substrate interaction.
• The mechanically interlocked daisy chain backbone effectively dissipated stress, enhancing cohesive strength.
• Superior adhesion performance was observed over a wide temperature range compared to controls.

Conclusions:

• The integration of mechanical bonds and H-bonding in DC-MIN adhesives offers a viable strategy for enhanced performance.
• Microscopic mechanical bond dynamics significantly influence macroscopic adhesive properties.
• This work provides a valuable framework for designing next-generation robust adhesives.