Synthesis, characterization and swelling behaviors of sodium alginate-g-poly(acrylic acid)/sodium humate superabsorbent

Hua, Shuibo; Wang, Aiqin

doi:10.1016/j.carbpol.2008.06.013

Cited by 176 publications

(65 citation statements)

References 27 publications

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“…In recent years, much interest has been shown in the development of the synthesis of natural-based superabsorbent hydrogels (Bagheri Marandi et al, 2011;Hua and Wang, 2009;Sadeghi and Hosseinzadeh, 2010;Zhang et al, 2007;Wang et al, 2009;Zheng and Wang, 2009;Chen et al, 2009). These biopolymer materials are crosslinked hydrophilic polymers, capable of absorbing large quantities of water, saline or physiological solutions (Buchholz and Graham, 1997;Peppas and Harland, 1990).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of collagen-g-poly(sodium acrylate-co-2-hydroxyethylacrylate) superabsorbent hydrogels

Sadeghi

Hosseinzadeh

2013

Braz. J. Chem. Eng.

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-Novel biopolymer-based superabsorbent hydrogels were prepared by grafting crosslinked poly(acrylic acid-co-2-hydroxyethyl acrylate) (PAA-co-PHEA) chains onto collagen backbones through a free radical polymerization method. The graft copolymerization reaction was carried out in a homogeneous medium and in the presence of ammonium persulfate (APS) as initiator and N,N ' -methylene bisacrylamide (MBA) as crosslinker. A proposed mechanism for collagen-g-(PAA-co-PHEA) formation was suggested and the hydrogel structure was confirmed using FTIR spectroscopy and TGA thermal analysis. Moreover, the morphology of the samples was examined by scanning electron microscopy (SEM). The effect of concentration of MBA as well as AA/HEA weight ratio on the swelling capacity of the hydrogel was also studied. Furthermore, the water absorbency of hydrogels was measured in solutions with pH ranging 1 to 13. The collagen-based hydrogel exhibited a pH-responsive character, so that a swelling-deswelling pulsatile behavior was recorded at pHs 2 and 8. Preliminary swelling and deswelling behaviors of the hydrogels were also studied. Additionally, the hydrogels exhibited salt-sensitivity and cation exchange properties.

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Section: Introductionmentioning

confidence: 99%

Synthesis and properties of collagen-g-poly(sodium acrylate-co-2-hydroxyethylacrylate) superabsorbent hydrogels

Sadeghi

Hosseinzadeh

2013

Braz. J. Chem. Eng.

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“…In the range of pH 4.0 -7.0, the ionization degree of carboxyl groups on CMCS chains increases with the increase of pH, which reduces the hydrogen bonds formed between carboxyl groups and increases electrostatic repulsion between ionized carboxyl groups. However when pH increased from 7.0 to 8.0, decreases in nanoparticle diameters were observed, this result might be attributed to the charge screening effect of the counter ions [28] [29]. Additionally, it was also discovered that with the pH value increasing from 4.0 to 7.0, the diameters of three samples (NP1, NP2 and NP3) increased by 1.38, 1.64 and 1.85 times, respectively, and the extent of the change was decreased in the following order: NP3 > NP2 > NP1.…”

Section: Ph-sensitivity Of the Nanoparticlesmentioning

confidence: 96%

Glutathione-Responsive Carboxymethyl Chitosan Nanoparticles for Controlled Release of Herbicides

Yu¹,

Sun²,

Hu³

et al. 2015

MSA

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Glutathione-responsive carboxymethyl chitosan nanoparticles cross-linked with disulfide bonds were developed for controlled release of herbicides. The nanoparticles were synthesized by selfassembly of amphiphilic carboxymethyl chitosan derivative (CMCS-MUA) in aqueous solution and subsequently producing disulfide cross-linking bonds by ultrasonic treatment. TEM showed that the nanoparticles had a spherical core-shell configuration with a size of about 250 nm. Assessment of stability of the nanoparticles (considering mean diameter, polydispersity, and Zeta potential) was conducted over a period of three months, and the nanoparticles were found to be stable in solution. Herbicide-loaded nanoparticles were prepared using diuron as a model herbicide. In vitro release study revealed that diuron can be released from nanoparticles in a controlled manner depended on the glutathione concentration. Herbicidal activity assays performed with preemergence treatment of target species (Echinochloa crusgalli) showed the effectiveness of diuron-loaded nanoparticles. Assays with nontarget species (Zea mays) showed that the diuronloaded nanoparticles did not affect plant growth. The results indicate that the glutathioneresponsive nanoparticles prepared in this work will be a promising candidate for controlled release of herbicides in agriculture.

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“…This indicated the homogeneous dispersion of RHC within the polymer matrix and the presence of RHC-matrix interfacial interaction. In comparison, the RHC-doped sample has an undulant and coarse surface, which facilitates the water penetration into the polymeric network, and then may improve the water absorbency of the resulting superabsorbent (Pourjavadi et al 2007;Hua and Wang 2009).…”

Section: Morphologymentioning

confidence: 99%

Rice Husk Char/Poly-(Acrylic Acid-co-acrylamide) Superabsorbent Hydrogels: Preparation, Characterization, and Swelling Behaviors

2017

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A series of novel rice husk char/poly-(acrylic acid(AA)-co-acrylamide(AM)) superabsorbent hydrogels were synthesized by graft copolymerization. The effects of the rice husk char (RHC) loading on their miscibility, shapes, and chemical structures were studied, and their swelling behaviors, kinetics, and pH response were evaluated. During the preparation, RHC reacted with acrylic acid. The RHC at lower loads (< mass ratios of RHC and AA of 1%) was scattered well within the polymer matrix, but an excessive load might result in the formation of large agglomerates. The swelling capacity and swelling rate of the hydrogels first were both increased with the rising RHC loading to 1% and then declined with further RHC loading. The superabsorbent hydrogel containing 1% RHC had the highest water absorbency (869 g/g in deionized water and 97 g/g in 0.9% NaCl solution).

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Synthesis, characterization and swelling behaviors of sodium alginate-g-poly(acrylic acid)/sodium humate superabsorbent

Cited by 176 publications

References 27 publications

Synthesis and properties of collagen-g-poly(sodium acrylate-co-2-hydroxyethylacrylate) superabsorbent hydrogels

Synthesis and properties of collagen-g-poly(sodium acrylate-co-2-hydroxyethylacrylate) superabsorbent hydrogels

Glutathione-Responsive Carboxymethyl Chitosan Nanoparticles for Controlled Release of Herbicides

Rice Husk Char/Poly-(Acrylic Acid-co-acrylamide) Superabsorbent Hydrogels: Preparation, Characterization, and Swelling Behaviors

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