NDLI: The evaluation of temperature and pH influences on equilibrium swelling of poly(N-isopropylacrylamide-co-acrylic acid) hydrogels

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The evaluation of temperature and pH influences on equilibrium swelling of poly(N-isopropylacrylamide-co-acrylic acid) hydrogels

Content Provider	Semantic Scholar
Author	Zdravković, Aleksandar S. Nikolic, Ljubisa Ilić-Stojanović, S. Snežana Nikolić, Vesna Savic, Sasa Kapor, Agneš
Copyright Year	2017
Abstract	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, α e , 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, α e = 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.
Starting Page	395
Ending Page	405
Page Count	11
File Format	PDF HTM / HTML
DOI	10.2298/HEMIND161018001Z
Volume Number	71
Alternate Webpage(s)	https://www.ache-pub.org.rs/index.php/HemInd/article/download/269/57
Alternate Webpage(s)	https://doi.org/10.2298/HEMIND161018001Z
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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