Tough, stretchable and compressive alginate-based hydrogels achieved by non-covalent interactions

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Alginate-based hydrogels are widely researched for their biocompatibility and versatility.
• Developing hydrogels with superior mechanical properties and self-healing capabilities remains a significant challenge.
• Existing methods often involve complex synthesis or lack robust performance.

Purpose of the Study:

• To synthesize novel alginate-based hydrogels with enhanced mechanical strength, toughness, and resilience.
• To investigate the structure-property relationships in dual physically crosslinked hydrogels.
• To explore the potential of these hydrogels in advanced material applications requiring self-recovery and fatigue resistance.

Main Methods:

• Synthesis of sodium alginate/poly(acrylamide) semi-interpenetrating network (NaAlg/PAM semi-IPN) hydrogels via micelle copolymerization.
• Preparation of calcium alginate/poly(acrylamide) double network (CaAlg/PAM DN) hydrogels through ionic crosslinking with CaCl2.
• Characterization using FT-IR, XPS, tensile, and compressive strength testing.

Main Results:

• Successfully synthesized NaAlg/PAM semi-IPN and CaAlg/PAM DN hydrogels through non-covalent interactions.
• CaAlg/PAM DN hydrogels exhibited significantly improved mechanical properties, with tensile strength reaching 733.6 kPa.
• The dual physically crosslinked hydrogels demonstrated fast self-recovery and good fatigue resistance due to dynamic reversible non-covalent interactions.

Conclusions:

• The developed CaAlg/PAM DN hydrogels offer a promising approach for creating materials with high mechanical strength, toughness, and rapid self-recovery.
• The dual physical crosslinking strategy effectively enhances hydrogel performance.
• This research provides a new pathway for designing advanced hydrogels with broad application potential.