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Swelling behavior of poly (N-hydroxymethylacrylamide- co -acrylic acid) hydrogels and release of potassium nitrate as fertilizer by Fatma Louzri; Sadjia Bennour is a Materials Science article available to read on EtoBox.

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Poly (N-hydroxymethylacrylamide-co-acrylic acid) [P(NHMA-AAx)] hydrogels were prepared by freeradical polymerization in aqueous solution at 56°C, using N,N′-methylenebisacrylamide as the cross-linking agent. The synthesized hydrogels were subsequently investigated by a series of characterization techniques including Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis and differential scanning calorimetry analysis. The effects of comonomer composition in the feed, pH, temperature and ionic strength on the swelling behavior were studied. Results indicated that the swelling capabilities of P(NHMA-AAx) hydrogels decreased with the increase in N-hydroxymethylacrylamide (NHMA) content in the polymeric matrix and ionic strength of the medium. Additionally, the hydrogels showed both temperature and pH responses. The dynamic swelling behaviors of hydrogels at different pH values followed a non-Fickian type. The P(NHMA-AAx) hydrogels were also loaded with potassium nitrate (KNO 3 ) as a model agrochemical, and the release kinetics of fertilizer from the hydrogels was studied as a function of KNO 3 and NHMA concentrations. Moreover, various kinetic parameters, such as r

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Author

Fatma Louzri; Sadjia Bennour

Publisher

Walter de Gruyter GmbH

Published

2017

Language

EN

Field

Materials Science (Physical Sciences)