Modified acrylic-based superabsorbent polymers (dependence on particle size and salinity)

Omidian, Hossein; Hashemi, Seyed Ali; Sammes, Peter G.; Meldrum, I.G.

doi:10.1016/s0032-3861(98)00394-2

Cited by 166 publications

(121 citation statements)

References 9 publications

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“…The rate parameters for superabsorbent are found to be 1.4, 4.2, 9.8, and 17.3 min for superabsorbent with particle sizes of 100-250, 250-400, 400-550, and 550-700 μm, respectively. It is well-known that the swelling kinetics for the superabsorbent polymers is significantly influenced by particle size of the absorbents [44]. With a lower the particle size, a higher rate of water uptake is observed.…”

Section: Swelling Kineticsmentioning

confidence: 99%

Synthesis and absorbency of gelatin-graft-poly(sodium acrylate-co-acrylamide) superabsorbent hydrogel with saltand pH-responsiveness properties

Pourjavadi¹,

Sadeghi²,

Hashemi³

et al. 2006

E-Polymers

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Abstract:In this article, we synthesize a novel gelatin-based superabsorbent hydrogel via graft copolymerization of mixtures of acrylic acid (AA) and acrylamide (AAm) onto gelatin backbones. The polymerization reaction was carried out in an aqueous medium and in the presence of ammonium persulfate (APS) as an initiator and N,N'-methylene bisacrylamide (MBA) as a crosslinker. The hydrogel structures were confirmed by FTIR spectroscopy. The effect of grafting variables, i.e. concentration of MBA and APS, AA/AAm weight ratio, and reaction time and temperature, was systematically optimized to achieve a hydrogel with swelling capacity as high as possible. The swelling behavior of these absorbent polymers was also investigated in various salt solutions. Results indicated that the swelling capacity decreased with an increase in the ionic strength of the swelling medium. Furthermore, the swelling of superabsorbing hydrogels was examined in solutions with pH values ranging between 1.0 and 13.0. It showed a reversible pH-responsive behavior at pHs 2.0 and 7.0. This on-off switching behavior makes the synthesized hydrogels an excellent candidate for controlled delivery of bioactive agents. Finally, the swelling kinetics of the synthesized hydrogels with various particle sizes was preliminarily investigated.

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Section: Swelling Kineticsmentioning

confidence: 99%

Synthesis and absorbency of gelatin-graft-poly(sodium acrylate-co-acrylamide) superabsorbent hydrogel with saltand pH-responsiveness properties

Pourjavadi¹,

Sadeghi²,

Hashemi³

et al. 2006

E-Polymers

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“…The hydrogels were polymerized by taking the mole ratio of AAm and AAc as 70:30, 60:40, 55:45, 50:50, 45:55, 40:60 and 30:70, which are designated G1, G2, G3, G4, G5, G6 and G7, respectively, and are shown in Table 1. NaOH (34.5%, w/w) was used to neutralize AAc up to pH 4.5 [20]. Monomer AAm and partially neutralized AAc were taken in poly(vinyl chloride) bottles of 500 ml capacity.…”

Section: Synthesis Of Cross-linked Poly(aam-co-aac) Hydrogelsmentioning

confidence: 99%

Synthesis of poly(acrylamide-co-acrylic acid)-based super-absorbent hydrogels by gamma radiation: study of swelling behaviour and network parameters

Tomar

Gupta

Singhal

et al. 2007

Designed Monomers and Polymers

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Abstract-A series of poly(acrylamide-co-acrylic acid) (poly(AAm-co-AAc))-based super-absorbent hydrogels (SAHs) was prepared by gamma radiation at the dose rate of 15 kGy. The amount of AAm was varied in the range of 30-70% (mol of total monomer) in feed. The co-polymers were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, nuclear magnetic resonance and network parameters, such as average molar mass between cross-links and cross-link density, were determined to explain the swelling behaviour. The experimental results indicated that an increase in the AAm content present in the hydrogels varied from 38.87% to 64.02%, equilibrium water absorbency decreased from 872 to 402 g H 2 O/g sample. The equilibrium water absorbency of various SAHs was investigated in different concentration of saline solutions. The effect of synthesized co-polymer on growth of seeds of ladyfinger is reported.

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“…The concentration of metal ions (i.e., counter ions) in the swelling medium influences the water absorbency of hydrogels [20]. To investigate this, three SAPs, namely SAP(0.991), SAP(1.481) and SAP(1.98), were equilibrated in distilled water and then put in salt solutions of varying concentrations, ranging from 0.01 to 0.80 M. The results (Fig.…”

Section: Swelling In Salt Solutionsmentioning

confidence: 99%

“…The dependency of swelling of a SAP system on the saline concentration may be defined by a new dimensionless quantity α, given as [20]:…”

Section: Swelling In Salt Solutionsmentioning

confidence: 99%

Inverse suspension polymerization of poly(methacrylic acid-co-partially neutralized acrylic acid) superabsorbent hydrogels: synthesis and water uptake behavior

Bajpai¹,

Bajpai²,

Sharma³

2007

Designed Monomers and Polymers

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Abstract-Superabsorbent poly(methacrylic acid-co-partially neutralized acrylic acid) hydrogels have been prepared by inverse suspension polymerization, using SPAN 80 as dispersant, heptane as the organic phase, N,N -methylene bisacrylamide as the cross-linker and potassium persulphate as initiator. The water uptake behavior has been analyzed as a function of amount of cross-linker, concentration of dispersant, stirring rate, synthesis temperature and particle size of gels. Their swelling behavior was also studied in salt solutions, Various types of diffusion coefficients and activation energy for swelling process were also evaluated.

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Modified acrylic-based superabsorbent polymers (dependence on particle size and salinity)

Cited by 166 publications

References 9 publications

Synthesis and absorbency of gelatin-graft-poly(sodium acrylate-co-acrylamide) superabsorbent hydrogel with saltand pH-responsiveness properties

Synthesis and absorbency of gelatin-graft-poly(sodium acrylate-co-acrylamide) superabsorbent hydrogel with saltand pH-responsiveness properties

Synthesis of poly(acrylamide-co-acrylic acid)-based super-absorbent hydrogels by gamma radiation: study of swelling behaviour and network parameters

Inverse suspension polymerization of poly(methacrylic acid-co-partially neutralized acrylic acid) superabsorbent hydrogels: synthesis and water uptake behavior

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