Super-absorbent polymers from starch-polyacrylonitrile graft copolymers by acid hydrolysis before saponification

Yamaguchi, M.; Watamoto, Harue; Sakamoto, Munenori

doi:10.1016/0144-8617(87)90041-5

Cited by 10 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The xerogels (dried gels) containing chitosan and polyacrylamide are higher in swelling than the polymer, and the swelling percentage increases with increasing chitosan concentration, which makes PAAM/chitosan have a 24% higher swelling rate than PAA/alginate. These gels have better performance and higher swelling because the one that contains chitosan contains more amine groups, which results in more hydrophilic groups, such as OCOO and OCONH2, whereas PAA/alginate only contains OH and COOH groups and only forms hydrogen bonds, resulting in less swelling than its counterpart [28][29][30]. The initial increase in the swelling capacity values was due to the high degree of crosslinking in the polymeric chains [31].…”

Section: Swelling Capacity Of Hydrogels In Watermentioning

confidence: 99%

Chitosan- and Alginate-Based Hydrogels for the Adsorption of Anionic and Cationic Dyes from Water

ALSamman

Sánchez

2022

Polymers

View full text Add to dashboard Cite

Novel hydrogel systems based on polyacrylamide/chitosan (PAAM/chitosan) or polyacrylic acid/alginate (PAA/alginate) were prepared, characterized, and applied to reduce the concentrations of dyes in water. These hydrogels were synthetized via a semi-interpenetrating polymer network (semi-IPN) and then characterized by Fourier transformed infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA), and their swelling capacities in water were measured. In the adsorption experiments, methylene blue (MB) was used as a cationic dye, and methyl orange (MO) was used as an anionic dye. The study was carried out using a successive batch method for the dye absorption process and an equilibrium system to investigate the adsorption of MO on PAAM/chitosan hydrogels and MB on PAA/alginate in separate experiments. The results showed that the target hydrogels were synthetized with high yield (more than 90%). The chemical structure of the hydrogels was corroborated by FTIR, and their high thermal stability was verified by TGA. The absorption of the MO dye was higher at pH 3.0 using PAAM/chitosan, and it had the ability to remove 43% of MO within 10 min using 0.05 g of hydrogel. The presence of interfering salts resulted in a 20–60% decrease in the absorption of MO. On the other hand, the absorption of the MB dye was higher at pH 8.5 using PAA/alginate, and it had the ability to remove 96% of MB within 10 min using 0.05 g of hydrogel, and its removal capacity was stable for interfering salts.

show abstract

Section: Swelling Capacity Of Hydrogels In Watermentioning

confidence: 99%

Chitosan- and Alginate-Based Hydrogels for the Adsorption of Anionic and Cationic Dyes from Water

ALSamman

Sánchez

2022

Polymers

View full text Add to dashboard Cite

show abstract

“…Among chemical methods, redox‐initiated grafting offers advantages, as grafting can be carried out under milder conditions with a minimum of side reactions. The grafting of acrylonitrile (AN) onto natural polymers such as guar gum,1–3 Leucaena glauca gum,4 starch,5–8 and cellulose9 through different redox initiators has been reported.…”

Section: Introductionmentioning

confidence: 99%

Graft copolymerization of acrylonitrile onto Cassia tora gum with ceric ammonium nitrate–nitric acid as a redox initiator

Sharma

Kumar

Soni

2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

The graft copolymerization of acrylonitrile (AN) onto Cassia tora gum (CTG) was carried out in an aqueous medium with a ceric ammonium nitrate (CAN)nitric acid initiation system. The percentage grafting and percentage grafting efficiency were determined as functions of the concentrations of CAN, nitric acid, AN, and CTG and the polymerization temperature and time. The results are discussed, and a reaction mechanism is proposed.

show abstract

“…A special kind of polymeric gel known as a superabsorbent can absorb water to several hundred times its own mass. This kind of polymer gel was first developed by a group of researchers at the Northern Regional Research Laboratory of the U.S. Department of Agriculture in the 1970s 1. This superabsorbency makes such gels very useful for many applications, such as disposable pads, sheets, and towels for surgery, adult incontinence, and female hygiene products, even though they were originally developed for agricultural applications to improve the water‐holding capacity of soils to promote the germination of seeds and plant growth.…”

Section: Introductionmentioning

confidence: 99%

Preparation and swelling properties of crosslinked sodium polyacrylate

Liu

Guo

2001

J of Applied Polymer Sci

103

View full text Add to dashboard Cite

ABSTRACT:Crosslinked sodium polyacrylate as a superabsorbent was prepared by inverse suspension polymerization with cyclohexane as the continuous phase and sorbite anhydride monostearic acid ester (span-80) as the dispersant. The crosslinking degree was regulated by NaOH. The distilled water absorbency (WA) of the polymer gel was about 700 times its own weight if the gel was allowed to swell at room temperature for 24 h. WA under various conditions, such as varying pH, temperature, reaction time, neutralization, and cyclohexane concentration, was investigated and optimized. Our results revealed that the optimal reaction conditions were 55°C, 25-min reaction time, 85% neutralization, and a 7:1 (v/v) cyclohexane/monomer ratio. Our results also showed that such synthesized polymer gels have a high WA and a good water-retention ability under different pressures.

show abstract

Super-absorbent polymers from starch-polyacrylonitrile graft copolymers by acid hydrolysis before saponification

Cited by 10 publications

References 9 publications

Chitosan- and Alginate-Based Hydrogels for the Adsorption of Anionic and Cationic Dyes from Water

Chitosan- and Alginate-Based Hydrogels for the Adsorption of Anionic and Cationic Dyes from Water

Graft copolymerization of acrylonitrile onto Cassia tora gum with ceric ammonium nitrate–nitric acid as a redox initiator

Preparation and swelling properties of crosslinked sodium polyacrylate

Contact Info

Product

Resources

About