Cycloreversion-enhanced toughness and degradability in mechanophore-embedded end-linked polymer networks

Area of Science:

• Polymer Chemistry
• Materials Science
• Mechanochemistry

Background:

• Achieving simultaneous toughness enhancement and triggerable degradation in single-network polymers is challenging.
• Modifying inherent chemical composition or network architecture is often required.

Purpose of the Study:

• To develop a smart polymer network with self-strengthening and self-destructing capabilities.
• To improve material toughness and degradability without altering polymer composition or architecture.

Main Methods:

• Embedding cyclobutane-fused tetrahydrofuran mechanophores into end-linked polymer networks.
• Investigating force-coupled cycloreversion of mechanophores under mechanical stress.
• Assessing degradation profiles under acidic conditions after ball-milling.

Main Results:

• Single-network materials exhibited threefold toughness and tenfold tear energies.
• Mechanical stress triggered mechanophore cycloreversion, releasing chain segments.
• Ball-milling exposed acid-sensitive units, enabling controlled degradation.

Conclusions:

• The developed polymer network demonstrates enhanced mechanical performance and on-demand degradability.
• Cyclobutane-fused tetrahydrofuran mechanophores provide a dual effect of strengthening and controlled degradation.
• This approach offers a promising strategy for advanced functional materials.