NC State
BioResources
Liu, Y., Chen, Y., Zhao, Y., Tong, Z., and Chen, S. (2015). "Superabsorbent sponge and membrane prepared by polyelectrolyte complexation of carboxymethyl cellulose/hydroxyethyl cellulose-Al3+," BioRes. 10(4), 6479-6495.

Abstract

A novel carboxymethyl cellulose/ hydroxyethyl cellulose-Al3+ (CMC/HEC-Al3+) hydrogel was prepared through electrostatic complexing between the anionic polyelectrolyte CMC and cationic cross-linking agent Al3+. The structure and properties of the hydrogel were characterized using FTIR, TGA, and SEM. The viscoelasticities of the swollen hydrogel were measured using the rheology test. The results indicated that a porous network structure was formed in the hydrogel. The content of CMC, HEC, and Al3+ can significantly affect its structure and characteristics. A sponge and membrane were prepared from the CMC/HEC-Al3+ hydrogel by freeze-drying and oven drying, respectively. Their swelling behaviors were investigated in water and saline solutions, and quantified with a swelling kinetic simulation. The results indicated that electrostatic effects, physical entanglement, and intra- and intermolecular hydrogen bonds contributed to the cross-linking network structure, with the electrostatic effect acting as the dominant force. In all, both superabsorbent sponge and membrane prepared from CMC/HEC-Al3+ hydrogel showed excellent swelling behavior and could be used in dressing wounds.
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