Graphene/cyclodextrin-based nanocomposite hydrogel with enhanced strength and thermo-responsive ability

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Dual crosslinked systems are effective for creating robust hydrogels.
• Graphene oxide (GO) and cyclodextrins (CD) are versatile materials for hydrogel fabrication.

Purpose of the Study:

• To synthesize a novel physical dual crosslinked hydrogel using GO, poly(acrylamide-co-poly(ethylene glycol) methyl ether methacrylate) (P(AM-co-PEGMA)), and α-cyclodextrin (CD).
• To investigate the mechanical properties, thermoplasticity, and thermo-responsive shape memory behavior of the synthesized hydrogel.

Main Methods:

• Copolymerization of acrylamide (AM) and PEGMA in an α-CD/GO solution.
• Characterization of the hydrogel's structure and properties through mechanical testing.

Main Results:

• The GO/P(AM-co-PEGMA)/CD hydrogel demonstrated excellent tensile properties, with a fracture strain of 1800% and fracture stress of 660 kPa.
• The hydrogel exhibited high compressive stress resistance (2.7 MPa at 85% strain) and notable thermoplastic and thermo-responsive shape memory behaviors.
• A one-pot synthesis method was employed, simplifying the fabrication process.

Conclusions:

• The physical dual crosslinked hydrogel offers superior mechanical strength and unique functional properties.
• The developed synthesis approach provides a facile route for designing high-performance hydrogels for advanced applications.