A new amphoteric superabsorbent hydrogel based on sodium starch sulfate

Area of Science:

• Polymer Chemistry
• Materials Science
• Biomaterials

Background:

• Superabsorbent hydrogels are crucial for absorption applications.
• Developing amphoteric hydrogels with enhanced swelling properties is an active research area.
• Starch-based hydrogels offer a sustainable and biodegradable alternative.

Purpose of the Study:

• To synthesize novel amphoteric superabsorbent hydrogels via graft copolymerization.
• To investigate the influence of polymerization conditions on hydrogel swelling capacity.
• To evaluate the crosslinking mechanisms and swelling performance in different solutions.

Main Methods:

• Graft copolymerization blending of acrylamide (AM), diallydimethylammonium chloride (DMDAAC), and sodium starch sulfate (SSS).
• Systematic investigation of polymerization parameters: temperature, initiator concentration, crosslinker concentration, and AM dosage.
• Swelling capacity measurements in distilled water and saline solutions.

Main Results:

• Optimized polymerization conditions significantly impact swelling capacity.
• Identified salt bonds as a potential crosslinking factor in the amphoteric hydrogel.
• Achieved maximum swelling capacities of 1493.1 g/g in distilled water and 91.0 g/g in saline solution.
• Compared performance against original starch-based hydrogels.

Conclusions:

• Successfully synthesized novel amphoteric superabsorbent hydrogels with tunable swelling properties.
• Demonstrated the effectiveness of graft copolymerization for creating high-performance hydrogels.
• The developed hydrogels exhibit promising potential for applications requiring high water absorption.