Entropy-Mediated Polymer-Cluster Interactions Enable Dramatic Thermal Stiffening Hydrogels for Mechanoadaptive Smart...

Area of Science:

• Materials Science
• Polymer Chemistry
• Soft Matter Physics

Background:

• Thermal stiffening materials offer adaptive strength for high-temperature applications.
• Achieving both high modulus change and mechanical strength in stiffened states is a key challenge.

Purpose of the Study:

• To develop novel thermal stiffening hydrogels with significant modulus enhancement.
• To explore the underlying mechanisms of entropy-mediated polymer-mineral interactions.
• To demonstrate the application of these hydrogels in smart fibers and fabrics.

Main Methods:

• Exploiting entropy-mediated polymer-mineral cluster interactions.
• Synthesizing hydrogels exhibiting a transition from liquid-liquid to solid-liquid phase separation.
• Fabricating sheath-core fibers and smart fabrics incorporating liquid metal fibers.

Main Results:

• Achieved a record storage modulus enhancement of 13,000 times (1.3 kPa to 17 MPa).
• Demonstrated a dramatic thermal stiffening effect driven by enhanced polymer-cluster interactions.
• Developed self-strengthening and self-powered sensing smart fabrics.

Conclusions:

• The developed hydrogels exhibit exceptional thermal stiffening capabilities.
• Entropy-mediated interactions are crucial for achieving large modulus changes.
• The smart fibers and fabrics show promise for advanced adaptive materials and wearable electronics.