Synthesis of anti-salt absorbent resins and studies of reaction mechanism

Zhu, Yabin; Pu, Bingyin; Zhang, Jianli; Shen, Jiacong

doi:10.1002/1097-4628(20010118)79:3<572::aid-app210>3.0.co;2-t

Cited by 10 publications

(9 citation statements)

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“…Table shows that the water absorbency of PAM/SA‐MMT composites in 0.9 wt % NaCl solution was higher than those of PAM and PAM/MMT, reaching 101 g g −1 . SA has good salt‐resisting property in specific case, the modification of MMT with SA benefits the improvement of the PAM polymeric network and consequently the salt‐resistant property of SA may be shown. In addition, this antisalt behavior may be due to the coeffect contribution of nonionic groups such as CONH 2 from PAM and OH from SA (or MMT).…”

Section: Resultsmentioning

confidence: 99%

“…In addition, SA has high affinity for water, the hydrophilic COO − Na + and OH groups on SA backbone may improve the water absorbency. According to Zhu et al, the antisalt ability of polyacrylic acid can be improved by the grafting copolymerization of acrylic acid onto SA, indicating the good salt‐resisting property of SA in specific case. Because of its good adsorption capacity and salt‐resisting property, SA was chosen as the polysaccharide components and played the role of clay modifier in this study.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced swelling and methylene blue adsorption of polyacrylamide‐based superabsorbents using alginate modified montmorillonite

Qiu

Wang

et al. 2013

J of Applied Polymer Sci

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Polyacrylamide/sodium alginate modified montmorillonite (PAM/SA-MMT) superabsorbent composites were synthesized by free-radical polymerization under normal atmospheric conditions. They were characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy (FTIR). Their water absorbency and methylene blue (MB) adsorption behaviors were studied. Compared with PAM/MMT composites, PAM/SA-MMT composites demonstrated greater water absorbency (863 g g 21 in distilled water and 101 g g 21 in 0.9 wt % NaCl solution) and higher adsorption capacity of 2639 mg g 21 for MB. The adsorption behaviors of the composites showed that the isotherms and adsorption kinetics were in good agreement with the Langmuir equation and pseudo-second-order equation, respectively. FTIR analysis suggested that the MB adsorption of PAM/SA-MMT composites via a mechanism combined electrostatic, H-bonding and hydrophobic interaction. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40013.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced swelling and methylene blue adsorption of polyacrylamide‐based superabsorbents using alginate modified montmorillonite

Qiu

Wang

et al. 2013

J of Applied Polymer Sci

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“…Graft polymerization of vinylic monomers onto natural backbones in the presence of crosslinkers is an efficient approach for the synthesis of natural‐based SAPs. Recently, considerable interest has been focused on employing natural polymers to produce hydrogels 7–14. Desirable features of SAPs are (i) high swelling capacity, (ii) high swelling rate and (iii) good strength of the swollen gel (high absorbency under load).…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrophobic monomer on the synthesis and swelling behaviour of a collagen‐graft‐poly[(acrylic acid)‐co‐(sodium acrylate)] hydrogel

Marandi

Hariri

Mahdavinia

2008

Polymer International

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BACKGROUND: Graft polymerization of vinylic monomers onto natural backbones is an efficient approach for the synthesis of natural-based superabsorbents. The nature of the monomers will affect the swelling behaviour of the superabsorbents. Here, a novel superabsorbent was synthesized through grafting of acrylic acid onto collagen in the presence of hydrophobic styrene as co-monomer. Subsequently, the effect of styrene on the swelling behaviour of the superabsorbent was studied. RESULTS: The highly swelling superabsorbent was prepared by introducing styrene into a collagen-graft-poly(acrylic acid)hydrogel. By inclusion of styrene monomer, the swelling capacity of the hydrogel was increased; this is discussed according to the network composition. The effect of swelling media (salt solutions and various pH values) was investigated. The results of absorbency under load showed that hydrogels containing phenyl groups exhibit better behaviour; however, by introducing styrene, the rate of water uptake and resistance to water holding under heating was reduced. Scanning electron micrographs of hydrogels revealed a decrease in porosity on using styrene. CONCLUSION: Inclusion of styrene monomer in the ionic superabsorbent caused high swelling capacity with better absorbency under load. This can be used to prepare highly swelling superabsorbents with good mechanical properties. The pH reversibility of the synthesized superabsorbent makes it a candidate for use in the controlled release of drugs and in agrochemicals.

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“…Because of these shortcomings, natural‐based SAPs have attracted much attention in recent years. Considerable interest has been focused on chemical modification of polysaccharides by grafting of synthetic polymers onto natural ones such as cellulose,7, 8 chitosan,9, 10 agar,11 Na‐alginate,12, 13 starch 14, 15…”

Section: Introductionmentioning

confidence: 99%

Optimization of synthetic conditions of a novel collagen‐based superabsorbent hydrogel by Taguchi method and investigation of its metal ions adsorption

Pourjavadi

Satha

Amini‐Fazl

et al. 2006

J of Applied Polymer Sci

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A novel biopolymer-based superabsorbent hydrogel was synthesized through chemical crosslinking by graft copolymerization of partially neutralized acrylic acid onto the hydrolyzed collagen, in the presence of a crosslinking agent and a free radical initiator. The Taguchi method, a robust experimental design, was employed for the optimization of the synthesis reaction based on the swelling capacity of the hydrogels. This method was applied for the experiments and standard L 16 orthogonal array with three factors and four levels were chosen. The critical parameters that have been selected for this study are crosslinker (N,N 0 -methylene bisacrylamide), initiator (potassium persulfate), and monomer (acrylic acid) concentration. From the analysis of variance of the test results, the most effective factor to control equilibrium swelling capacity was obtained and maximum water absorbency of the optimized final product was found to be 500 g/g. The surface morphology of the gel was examined using scanning electron microscopy. Furthermore, the sorption capacity of the hydrogel toward bivalent metal ions was evaluated. Therefore, the hydrogel may be considered as a candidate to develop as an efficient biopolymer-based chelating hydrogel for water treatment.

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Synthesis of anti-salt absorbent resins and studies of reaction mechanism

Cited by 10 publications

References 0 publications

Enhanced swelling and methylene blue adsorption of polyacrylamide‐based superabsorbents using alginate modified montmorillonite

Enhanced swelling and methylene blue adsorption of polyacrylamide‐based superabsorbents using alginate modified montmorillonite

Effect of hydrophobic monomer on the synthesis and swelling behaviour of a collagen‐graft‐poly[(acrylic acid)‐co‐(sodium acrylate)] hydrogel

Optimization of synthetic conditions of a novel collagen‐based superabsorbent hydrogel by Taguchi method and investigation of its metal ions adsorption

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