Borax Cross-Linked Acrylamide-Grafted Starch Self-Healing Hydrogels

Area of Science:

• Materials Science
• Polymer Chemistry

Background:

• Starch-based hydrogels are biocompatible and renewable but suffer from poor mechanical properties and limited durability.
• Simultaneously improving mechanical strength and self-healing capabilities in hydrogels is a significant challenge.

Purpose of the Study:

• To synthesize a novel self-healing hydrogel with enhanced mechanical properties and recovery.
• To investigate the impact of synthesis parameters on hydrogel performance.

Main Methods:

• Grafting acrylamide onto starch using ceric ammonium nitrate (CAN) as an initiator.
• Cross-linking the grafted polymer with borax to form the hydrogel network.
• Systematic analysis of starch-to-monomer ratio, borax concentration, and CAN concentration effects.

Main Results:

• The synthesized hydrogel exhibited significantly improved mechanical strength, with a 1.8-fold increase in maximum storage modulus.
• Dynamic borate ester bonds and hydrogen bonding contributed to remarkable self-healing and temperature responsiveness.
• Optimized synthesis parameters led to enhanced hydrogel performance.

Conclusions:

• The developed starch-based hydrogel offers a promising solution for overcoming the limitations of traditional hydrogels.
• The material's enhanced properties pave the way for broader applications in agriculture, sensors, and wastewater treatment.
• This research contributes to the advancement of functional biomaterials.