Abstract
In this work, acrylamide (AAm) and crotonic acid (CA) were grafted onto carboxymethyl cellulose (CMC) by free-radical polymerization in aqueous solution at 60°C, using potassium persulfate (KPS) as an initiator and N,N′-methylenebisacrylamide (MBAA) as a cross-linking agent. The prepared hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The swelling behavior of hydrogels was studied as a function of CA amount, CMC composition, pH, and temperature of medium. The obtained results indicated that the degree of swelling is enhanced with increasing CMC amount, and is dependent on temperature and pH. To evaluate the controlled release potential of the hydrogel, NH4NO3 fertilizer was incorporated in the polymeric matrix by in situ polymerization method. The results revealed that the fertilizer release kinetics is affected by CMC, CA, and NH4NO3 compositions. The fertilizer release mechanism was determined by comparing the release data with the zero-order, first-order, Higuchi and Korsmeyer–Peppas kinetic models. Results indicated that the Korsmeyer–Peppas model can be employed to elucidate the release characteristics of the fertilizer and that Fickian diffusion dominates the release mechanism process.
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Daoud, L., Bennour, S. Synthesis and Characterization of Carboxymethyl Cellulose-graft-Poly(Acrylamide-co-Crotonic Acid) Hydrogel: Matrix for Ammonium Nitrate Release, as Agrochemical. Russ J Appl Chem 94, 1499–1512 (2021). https://doi.org/10.1134/S1070427221110057
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DOI: https://doi.org/10.1134/S1070427221110057