Synthesis and properties of starch-graft-polyacrylamide/clay superabsorbent composite

Wu, Jihuai; Lin, Jianming; Zhou, Meng; Wei, Congrong

doi:10.1002/1521-3927(20001001)21:15<1032::aid-marc1032>3.0.co;2-n

Cited by 233 publications

(172 citation statements)

References 6 publications

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“…Thereby, with the crosslinker content increasing, the crosslinking density increases. As a result, the network space gets diminished, and less water enters the hydrogel [23]. …”

Section: Effect Of Mba Concentrationmentioning

confidence: 99%

Synthesis of porous poly(acrylamide) hydrogels using calcium carbonate and its application for slow release of potassium nitrate

Mahdavinia¹,

Mousavi²,

Karimi³

et al. 2009

Express Polym. Lett.

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Abstract. Porous poly(acrylamide) was synthesized using calcium carbonate microparticles and subsequent acid treatment to remove the calcium carbonate. Methylenebisacrylamide and ammonium persulfate/sodium metabisulfite were used as crosslinking agent and redox initiator, respectively. The porous structure of resulted hydrogels was confirmed using SEM micrographs. The effect of methylenebisacrylamide concentration and calcium carbonate amount on the swelling of the hydrogels was investigated. The results showed that the effect of methylenebisacrylamide and calcium carbonate variables on the swelling is reverse. The hydrogels were subsequently utilized for the loading of potassium nitrate. Potassium nitrate as active agent was loaded into hydrogels and subsequently the release of this active agent was investigated. In these series of investigation, the effect of content of loading, methylenebisacrylamide and calcium carbonate amount on the release of potassium nitrate from hydrogels was investigated.

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“…Thereby, with the crosslinker content increasing, the crosslinking density increases. As a result, the network space gets diminished, and less water enters the hydrogel [23]. …”

Section: Effect Of Mba Concentrationmentioning

confidence: 99%

Synthesis of porous poly(acrylamide) hydrogels using calcium carbonate and its application for slow release of potassium nitrate

Mahdavinia¹,

Mousavi²,

Karimi³

et al. 2009

Express Polym. Lett.

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“…Nowadays, the worldwide production of SAPs is more than one million tons in year. Hence, synthesis and characterization of superabsorbent hydrogels is the main goal of the several research groups in the world [3][4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Investigation of a Novel pH- and Salt-Responsive Superabsorbent Hydrogel Based on Pectin

Sadeghi¹,

Mohammadinasab²,

Shafiei³

2012

Orientjchem.

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In the present paper, attention is paid to synthesis and investigates swelling behavior of a superabsorbent hydrogel based on Pectin (Pec) and polyacrylic acid (PAcA). acrylic acid (AcA) was graft copolymerized onto Pectin backbones by a free radical polymerization technique using ammonium persulfate (APS) as initiator and methylene bisacrylamide (MBA) as a crosslinker. A proposed mechanism for hydrogel formation was suggested and the structure of the product was established using FTIR and SEM spectroscopies. Under the optimized conditions concluded, maximum capacity of swelling in distilled water was found to be 348 g/g. Absorbency of the synthesized hydrogels was also measured in NaCl and CaCl 2 salt solutions. Results indicated that the swelling ratios in compare to water decreased with an increase in the ionic strength of solution. In addition, swelling capacity was conducted in solutions with pH ranged from 1 to 13. The H-Pecpoly(sodium acrylate) hydrogel exhibited a pH-responsiveness character so that a swellingdeswelling pulsatile behavior was recorded at pHs 3 and 9.

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“…Thus, many potential applications of conventional polymeric hydrogels have been restricted or abandoned because of their limitations. In past several years some attempts have been done to modify the properties of super absorbents by incorporation of nano or micro particles of inorganic materials such as montmorillonite [21][22][23], kaolin [24,25], mica [26], sercite [27], bentonite [28] and laponite clay [15] into polymer networks . Incorporation of these mineral powders not only reduces costs but also improves the properties (such as swelling ability, gel strength, mechanical and thermal stability) [28].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of poly(acryl amide-coacrylic acid)/nay and Clinoptilolite nanocomposites with improved methylene blue dye removal behavior from aqueous solution

2011

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Abstract:The nanocomposites of poly(acryl amide-co-acrylic acid) with NaY and Clinoptilolite were prepared using ammonium persulfate as an initiator and N,N′-methylene bis acryl amide as the cross-linker. The morphology was characterized by SEM and the structure of nanocomposite materials was studied with XRD and FT-IR that showed the interaction between porous materials and poly(AAm-coAAc). Thermo gravimetric analyzer (TGA) curve shows that all the chain-extended poly(AAm-co-AAc) are stable up to 250 °C and maximum weight loss occurs at 890 °C. The TGA results indicated higher stability for poly(acryl amide-co-acrylic acid)/NaY and Clinoptilolite composites than poly(AAm-co-AAc). The adsorption and desorption behavior of methylene blue were investigated for nanocomposites. It was shown that poly(AAm-co-AAc)/NaY and Clinoptilolite nanocomposites have higher adsorption than NaY, Clinoptilolite and poly(AAm-co-AAc) alone. This effect was attributed to good interaction between the hydroxyl group in porous materials and carboxylic group in poly(AAm-co-AAc) with methylene blue.

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Synthesis and properties of starch-graft-polyacrylamide/clay superabsorbent composite

Cited by 233 publications

References 6 publications

Synthesis of porous poly(acrylamide) hydrogels using calcium carbonate and its application for slow release of potassium nitrate

Synthesis of porous poly(acrylamide) hydrogels using calcium carbonate and its application for slow release of potassium nitrate

Synthesis and Investigation of a Novel pH- and Salt-Responsive Superabsorbent Hydrogel Based on Pectin

Preparation and characterization of poly(acryl amide-coacrylic acid)/nay and Clinoptilolite nanocomposites with improved methylene blue dye removal behavior from aqueous solution

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