Successive mechanochemical activation and small molecule release in an elastomeric material

Area of Science:

• Materials Science
• Polymer Chemistry
• Mechanochemistry

Background:

• Mechanochemically responsive materials can release substances under mechanical stress.
• Developing materials for controlled, successive molecular release remains a challenge.

Purpose of the Study:

• To develop a material capable of successive molecular release upon repeated compression.
• To investigate the impact of repeated mechanical stress on mechanophore activation and material properties.

Main Methods:

• Incorporation of a flex-activated mechanophore into an elastomeric polyurethane network.
• Application of repeated compressive stress to the material.
• Analysis of mechanophore activation and changes in the mechanical behavior of the polymer matrix.

Main Results:

• The developed material successfully released small organic molecules upon successive compressions.
• The flex-activated mechanophore enabled incremental increases in activation without main chain scission.
• Repeated compressions influenced both mechanophore activity and the elastomeric matrix's mechanical properties.

Conclusions:

• A novel mechanochemically responsive material with tunable molecular release capabilities was created.
• The material demonstrates potential for applications requiring controlled, on-demand substance delivery triggered by mechanical stimuli.