A Highly Stretchable Polymer that Can Be Thermally Healed at Mild Temperature

Area of Science:

• Materials Science
• Polymer Chemistry

Background:

• Achieving both high stretchability and self-healing in synthetic materials is difficult.
• Self-healing often requires weaker bonds that are not ideal for elastic materials.

Purpose of the Study:

• To create a highly elastic polymer with efficient self-healing capabilities.
• To investigate the role of dynamic Fe(III)-triazole coordination bonds in achieving these properties.

Main Methods:

• Incorporating dynamic Fe(III)-triazole coordination bonds into a polydimethylsiloxane (PDMS) backbone.
• Characterizing the material's stretchability and thermal self-healing performance.

Main Results:

• The resulting polymer demonstrated high elasticity, stretching up to 3400% strain.
• The material achieved over 90% healing efficiency after thermal treatment at 60 °C for 20 hours.

Conclusions:

• Dynamic Fe(III)-triazole coordination bonds enable simultaneous stretchability and thermal self-healing in PDMS.
• The unique coordination chemistry of Fe(III)-triazole complexes is key to the material's enhanced properties.