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https://open.uns.ac.rs/handle/123456789/3711
Title: | The evaluation of temperature and pH influences on equilibrium swelling of poly(N-isopropylacrylamide-co-acrylic acid) hydrogels | Authors: | Zdravković, A. Nikolić, Lj. Ilić-Stojanović, S. Manojlović Nikolić, V. Savić, M. Kapor, Agneš |
Issue Date: | 1-Jan-2017 | Journal: | Hemijska Industrija | Abstract: | © 2017, Association of Chemists and Chemical Engineers of Serbia. All rights reserved. Hydrogels are synthesized by the method of radical polymerization of monomers: N-isopropylacrylamide (NIPAM) and acrylic acid (AA). Characterization of poly(N-isopropylacrylamide- co-acrylic acid) hydrogels, p(NIPAM/AA), has been performed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and by determination of the swelling behaviour in aqueous solutions at different temperatures (25, 31 and 37 °C) and pH values (2.2, 4.5, 6 and 6.8). After lyophilisation in the solution at pH 6 and temperature of 25 °C, p(NIPAM/AA) hydrogels have rapidly reached equilibrium degree of swelling, αe, in comparison to non-lyophilized samples. The mechanism of solvent transport within matrix in lyophilized samples corresponds to less Fickian diffusion, whereas Super case II diffusion is characteristic for non-lyophilized samples. p(NIPAM/AA) hydrogel with 1.5 mol% of ethylene glycol dimethacrylate (EGDM) at the temperature of 25 °C and pH 6.8, has reached the highest swelling equilibrium degree, αe = 259.8. The results of swelling studies have shown that p(NIPAM/AA) hydrogels can be classified as superabsorbent polymers (SAPs). For the evaluation of pH and temperature influences on synthesized hydrogels swelling, a full three-level experimental design has been used. Two-factor interaction model (2FI) is the most optimal model of a full three-level experimental design for representing the swelling equilibrium degree of p(NIPAM/AA) hydrogels as a function of investigated parameters, i.e., temperature and pH. | URI: | https://open.uns.ac.rs/handle/123456789/3711 | ISSN: | 0367598X | DOI: | 10.2298/HEMIND161018001Z |
Appears in Collections: | Naučne i umetničke publikacije |
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