NOVEL SUPERABSORBENT HYDROGEL COMPOSITE BASED ON POLY(ACRYLAMIDE-<i>CO</i>-ACRYLATE)/NONTRONITE: CHARACTERIZATION AND SWELLING PERFORMANCE

Leitão, Renan C. F.; Moura, C. P. de; Silva, Lindomar R. D. da; Ricardo, Nágila Maria Pontes Silva; Feitosa, Judith P.A.; Muniz, Edvani C.; Fajardo, André R.; Rodrigues, Francisco H. A.

doi:10.5935/0100-4042.20150008

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Magalhães et al [ 49 ] reported swelling degree values from 144 to 189 for hydrogels where they varied the amount of sodium acrylate in the formulation of poly(sodium acrylate-co-acrylamide) hydrogels. Leitão et al [ 50 ] reported swelling degrees from 620 to 1100 times in acrylamide/potassium acrylate hydrogels crosslinked at 0.05, 0.1, and 0.2% mol with respect to the total mass of monomers.…”

Section: Resultsmentioning

confidence: 99%

Physicomechanical and Morphological Characterization of Multi-Structured Potassium-Acrylate-Based Hydrogels

Gradilla-Orozco¹,

Hernández-Jiménez

Robles-Vásquez

et al. 2022

Gels

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In this work, a photo-polymerization route was used to obtain potassium acrylate-co-acrylamide hydrogels with enhanced mechanical properties, well-defined microstructures in the dry state, and unique meso- and macrostructures in the hydrated state. The properties of the hydrogels depended on the concentration of the crosslinking agent. Mechanical properties, swelling capacity, and morphology were analyzed, showing a well-defined transition at a critical concentration of the crosslinker. In terms of morphology, shape-evolving surface patterns appeared at different scales during swelling. These surface structures had a noticeable influence on the mechanical properties. Hydrogels with structures exhibited better mechanical properties compared to unstructured hydrogels. The critical crosslinking concentration reported in this work (using glycerol diacrylate) is a reference point for the future preparation of multistructured acrylic hydrogel with enhanced properties.

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Section: Resultsmentioning

confidence: 99%

Physicomechanical and Morphological Characterization of Multi-Structured Potassium-Acrylate-Based Hydrogels

Gradilla-Orozco¹,

Hernández-Jiménez

Robles-Vásquez

et al. 2022

Gels

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“…The water retention capacity was determined through the addition of 500 mL of distilled water to saturate one gram of the hydrogel with five replicates. The saturated material was kept for 24 h in 500 mL beakers covered with plastic film to prevent evaporation, due to the time required to achieve the swelling balance of a superabsorbent polyacrylamide gel and for maintaining this balance (Leitão et al, 2015). After 24 h of saturation, the polymer samples were placed on a 0.5-mm-mesh sieve to drain the gravitational water.…”

Section: Characterization Of the Hydrogelmentioning

confidence: 99%

Hydrogel composed of potassium acrylate, acrylamide, and mineral as soil conditioner under saline conditions

Costa

Freire

Lourenço

et al. 2022

Sci. agric. (Piracicaba, Braz.)

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Hydrogels have potential as soil conditioners due to their high capacity to retain water and mitigate soil salinity. However, investigations under saline conditions are necessary because there are losses in both water absorption and salinity mitigation depending on the composition of hydrogel and ions involved in salinity. In this work, we studied a commercial hydrogel in two experiments. The first experiment was conducted in the laboratory to evaluate the absorption by the hydrogel of water with electrical conductivity (EC) of 0.5, 1.5, 3.0, and 4.5 dS m -1 , promoted by NaCl. The second experiment was conducted in a greenhouse in a 2 × 4 factorial scheme (with and without hydrogel × EC of the first experiment). Although salinity reduced water absorption by hydrogel by 84 %, the polymer applied in a sandy soil under saline conditions reduced water losses by 58 %. However, hydrogel did not increase the final soil moisture (~ 0.10 g g -1 ). The polymer reduced Na + concentration in leachate from 1,499 to 1,219 mg L -1 at the highest salinity level (4.5 dS m -1 ), but it increased Na + soil availability by 0.1 mg kg -1 in comparison with polymer absence. Hydrogel application increased Na + content in plants from 9 to 13 mg kg -1 at the highest salinity, while K + content was 10 to 16 mg kg -1 lower than that observed without a polymer. Hydrogel 0.07 % (w/w) reduced maize biomass, indicating damage by monovalent ions, compromising the polymer potential under salinity.

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“…After 24-h of equilibrium swelling, P(KA) exhibited a slightly higher water absorbency (387 ± 12 g/g) than that of P(Amco-KA) (338 ± 16 g/g) which might be contributed by the greater degree of ionization of the carboxylic groups originated from KA solely in distilled water. Basically, the extent of water absorbency related directly to the cross-link density which controls the expansion of polymer network to enable penetration of water molecules [18]. Electrostatic interactions between the amino cations originated from AM and the carboxylate anions formed a rather rigid network structure that prohibited the expansion of polymer networks [19].…”

Section: Structure and Property Of The Synthesized Sap Polymersmentioning

confidence: 99%

Degradation of Acrylic Acid/acrylamide Superabsorbent Copolymer

Bankeeree

Samathayanon

Prasongsuk

et al. 2021

Preprint

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Poly(potassium acrylate), P(KA), and poly[acrylamide-co-(potassium acrylate)], P(Am-co-KA), were synthesized and an effective degradation technique of the polymers via chemical and biological processes were pursued. Significant reductions in dry mass and water absorbency were observed after P(KA) (53% and 54%, respectively) and P(Am-co-KA) (43% and 40%, respectively) were buried in the soil for ten weeks. The living fungal culture failed to degrade the polymers, but the enzymatic treatment using crude peroxidase (20 U/g) for 16 h significantly decreased the dry mass (15%; 15.0±0.3 g) and water absorbency (13%; 16.0±1.0 g/g) of P(KA). Chemical oxidation using H2O2 at high temperature with/without peroxidase efficiently degraded P(KA) and P(Am-co-KA). The maximum degradation of P(KA) (99.84% weight loss) was obtained when incubated with 12.8% (v/w) H2O2 at 65 ºC for 7.3 h while 98.43% weight loss was achieved after P(Am-co-KA) was incubated with 14.8% (v/w) H2O2 at 68 ºC for 9.2 h. No significant inhibition was observed in seed germination of mung bean grown on the untreated polymers but sweet corn was slightly inhibited. The effects of degraded products on mung bean germination were not significantly different from the control and untreated polymers. On sweet corn, the degraded products were apparently less toxic than did the untreated polymers. These results suggested that the rapid and efficient degradation of polyacrylate and its copolymer by the thermo-oxidation of H2O2 could be applied for a larger scale of SAP waste management.

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NOVEL SUPERABSORBENT HYDROGEL COMPOSITE BASED ON POLY(ACRYLAMIDE-CO-ACRYLATE)/NONTRONITE: CHARACTERIZATION AND SWELLING PERFORMANCE

Cited by 7 publications

References 3 publications

Physicomechanical and Morphological Characterization of Multi-Structured Potassium-Acrylate-Based Hydrogels

Physicomechanical and Morphological Characterization of Multi-Structured Potassium-Acrylate-Based Hydrogels

Hydrogel composed of potassium acrylate, acrylamide, and mineral as soil conditioner under saline conditions

Degradation of Acrylic Acid/acrylamide Superabsorbent Copolymer

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