Morphological and Swelling Potential Evaluation of Moringa oleifera Gum/Poly(vinyl alcohol) Hydrogels as a Superabsorbent

Abstract

Synergistic use of superabsorbent hydrogels has vital contribution to the daily life. This work gives an account of a facile approach to synthesize superabsorbent hydrogels based on Moringa oleifera gum and polyvinyl alcohol cross-linked with borax. Fourier transform infrared, X-ray diffraction, and scanning electron microscopy were employed to characterize the structure, crystallinity, and surface morphologies of the samples. The cross-link density, swelling ratio, reswelling, water retention properties, and salt sensitivity of hydrogels were investigated. Reaction parameters for the hydrogel synthesis were optimized on the basis of water absorbency, and the reaction condition of greater water absorbency after 12 h at room temperature was taken as an ideal condition. Optimum conditions were obtained as [poly(vinyl alcohol) PVA] = 10% (w/v) and [borax] = 1.05 × 10 –3 mol/L. Under the optimized conditions, the maximum swelling ratio of MOG/PVA hydrogel reached 1163 g/g in deionized water and 290 g/g in 0.9 wt % NaCl solution. Furthermore, all hydrogels exhibited salt sensitivity and excellent water retention capacity under the high temperature state and displayed smart swelling behaviors in physiological saline solutions. The water absorbency, reusability, and salt sensitivity of the hydrogels give these smart polymer wide promising applications.

Preparation and properties of a biodegradability superabsorbent composite based on flax cake protein‐g‐poly (acrylic acid)/Kaolinite

“…In 0.9% NaCl, the maximum swelling capacity is 78 g/g when the swelling time is 30 min. In comparison with the research works reported in the literature, the superabsorbent composite prepared in this study possessed faster swelling rate and higher swelling capacity 8,34,35 …”

Green Hydrogel Synthesis: Emphasis on Proteomics and Polymer Particle-Protein Interaction

“…Montheil introduced a “biocompatible catalysis” approach for bioink formation using aqueous solutions in which silylated hydroxypropylmethyl cellulose crosslinking was catalyzed by NaF and/or glycine [ 166 ]. “Catalyst-free” superabsorbent hydrogel synthesis in water was demonstrated by Ahmad et al via crosslinking Moringa oleifera gum and polyvinyl alcohol with borax [ 167 ]. As a more biocompatible alternative to the Irgacure 2959 photoinitiator, Bui et al synthesized a catechol-functionalized hydrogel using dopamine as a photoinitiator to polymerize sulfobetaine methacrylate and BIS in Tris buffer.…”

Preparation and characterization of pH‐sensitive carboxymethyl cellulose‐based hydrogels for controlled drug delivery

“…where D and D 0 are the same as for Eqn (2). The release of ofloxacin from the dry loaded gel was measured by placing it in phosphate buffer (500 mL, pH 7.4) at 37 °C, simulated blood medium, for 61.5 h with constant stirring.…”

“…Superabsorbent hydrogels are hydrophilic, three‐dimensional networks that can easily swell with water or other liquids up to thousands of times their own dry weight while maintaining their physical dimension structures. Because of their exceptional properties, they are widely used in various industrial applications such as agriculture, foods, personal care products, cosmetics, medicines and other biomedical applications 1–3 . Hydrogels that respond to external conditions such as heat, pH, chemical environments, etc., are often referred to as smart hydrogels.…”

“…Because of their exceptional properties, they are widely used in various industrial applications such as agriculture, foods, personal care products, cosmetics, medicines and other biomedical applications. [1][2][3] Hydrogels that respond to external conditions such as heat, pH, chemical environments, etc., are often referred to as smart hydrogels. Among the smart hydrogels, pH-sensitive ones have been investigated and used widely because of their useful properties for drug delivery and other biomedical proposes.…”