Double-modified guar gum dual-network hydrogels with balanced mechanical and swelling properties

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Polysaccharide hydrogels face limitations in mechanical strength, swelling capacity, and stability, hindering industrial applications.
• A key challenge is overcoming the trade-off between hydrogel strength and water absorption.

Purpose of the Study:

• To develop a novel polysaccharide-based hydrogel with enhanced mechanical properties and swelling capacity.
• To create a dual-network hydrogel system addressing the limitations of traditional polysaccharide hydrogels.
• To demonstrate the hydrogel's adaptability for agricultural and biomedical applications.

Main Methods:

• A dual-side-chain modification strategy involving hydroxypropylation and phosphation of guar gum.
• Construction of a rigid-flexible dual-network (DN) hydrogel via interpenetration of modified guar gum and polyacrylamide (PAM).
• Identification of a critical crosslinking density threshold for optimal network formation.

Main Results:

• The dual-network hydrogel achieved a compressive strength over 500 kPa and a swelling ratio of 46-fold, balancing mechanical performance and swelling.
• Borate-ion-crosslinked hydrogels maintained 85% mechanical properties under high temperature and salinity for agricultural use.
• Phosphorylated hydrogels demonstrated pH-responsive swelling for application in complex wound dressings.

Conclusions:

• The developed scenario-adaptive, bio-based hydrogel offers a viable solution for extreme environment water retention and advanced wound care.
• This work provides a design paradigm for polysaccharide-based hydrogels with balanced mechanical-swelling properties.
• The dual-network strategy effectively overcomes the inherent limitations of polysaccharide hydrogels.