Dual-responsive shape memory hydrogels with novel thermoplasticity based on a hydrophobically modified polyampholyte

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Shape memory hydrogels can recover their original shape without external forces.
• Existing hydrogels often rely on chemical cross-linking, limiting their adaptability.

Purpose of the Study:

• To develop a novel dual-responsive shape memory hydrogel with unique thermoplastic properties.
• To explore a facile synthesis strategy for advanced hydrogel systems.

Main Methods:

• Ternary copolymerization of acrylamide (AM) and acrylic acid (AA) with a cationic surfmer.
• Utilizing ionic/complex binding and salt-dependent hydrophobic association for shape memory.
• Investigating shape recovery triggered by reducing agents or deionized water.

Main Results:

• A water-insoluble, dual-responsive shape memory hydrogel was successfully synthesized without organic cross-linkers.
• The hydrogel demonstrated successful shape memorization and recovery.
• The material exhibited unique thermoplasticity, allowing shape modification upon heating and fixation upon cooling.

Conclusions:

• The developed hydrogel offers a facile strategy for creating stimulus-responsive materials.
• The thermoplasticity of this hydrophobic polyampholyte hydrogel distinguishes it from conventional systems.
• This work opens new avenues for the design and application of advanced shape memory hydrogels.