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Effect of zinc ion concentration on crosslinking of carboxymethyl cellulose sodium-fumaric acid composite hydrogel
Author(s)
Uyanga, Kindness A.
Iamphaojeen, Yuwanda
Daoud, Walid A.
Date Issued
May 26, 2021
Type
Article
Abstract
Anionic polysaccharides are known to react in unconventional patterns with di-valent metal ions to form 3D-structured hydrogels. However, little is known about the influence of divalent ions concentration on hydrogel formation. Herein, carboxymethyl cellulose based hydrogels crosslinked with zinc ions (Zn2+) and fumaric acid are synthesized and characterized for swelling, structure, morphology and thermal properties, and the effect of Zn2+ concentration on hydrogel properties is investigated. It was found that increasing Zn2+ to 0.5 M enhances gel fraction and water absorbency, at which super-absorbent yet stable, crystalline (79% crystallinity index) FA-0.5 exhibiting water-absorbency (2259%) and stability toward water (51%) and heat (−3.17 mW and 0.9% degradation at 50 °C) is formed. The results reveal that crosslinking is influenced by Zn2+ concentration and interaction with other hydrogel components. The hydrolytic and thermal properties of FA-0.5 shows potential as a stable biomaterial.
Citation
Polymer, 225, 2021