Overentrant swelling behaviour of poly(potassium, 3-sulfopropyl acrylate-acrylic acid) gels

Narimani, Farhad; Zohuriaan‐Mehr, M. J.; Kabiri, Kourosh; Bouhendi, H.; Omidian, Hossein; Najafi, Vahid

doi:10.1007/s10965-012-0007-2

Cited by 11 publications

(8 citation statements)

References 28 publications

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“…The first weight loss at 20-110°C is related to moisture removal, the second weight loss at 250-300°C may be due to the loss of the carboxylic group and a third weight loss at 320-370°C can be attributed to thermal degradation of sulfonic acid groups. It was previously reported that sulfonate groups are thermally more resistant than carboxyl groups [11]. As was expected, the increase in sulfonated monomer content caused a thermo-stability enhancement.…”

Section: Alcohol Absorbencysupporting

confidence: 68%

“…5, confirmed that more ASTCA content increased the Tg and decreased the peak area under the matrix peak [10,11]. These results show a greater chain movement of ASTCAH 10 due to weaker intermolecular or intramolecular interaction than in ASTCAH 30.…”

Section: Dmtasupporting

confidence: 56%

“…They found that the AMPS ionic monomer had a significant influence on the alcohol absorbency enhancement. After that they synthesized and introduced the copolymer of acrylic acid with different sulfonic monomers such as sodium styrene sulfonate [10], potassium 3-sulfo propyl acrylate potassium salt [11], and some phosphonic acid monomers [12] for absorbing of alcohols.…”

Section: Introductionmentioning

confidence: 99%

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Swelling behavior and characterization of alcohol-specific superabsorbing gels based on acrylic acid and allyl tetrasodium thiacalix[4]arene tetrasulfonate

Narimani

Lakouraj

2015

J Polym Res

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Allyl tetrasodium thiacalix[4]arene tetrasulfonate (ASTCA) was synthesized via functionalization of tetrasodium thiacalix[4]arene tetrasulfonate (STCA). Alcohol-specific superabsorbing gels (superalcogels) based on acrylic acid (AA, 60-90 mol%) and allyl tetrasodium thiacalix[4]arene tetrasulfonate (ASTCA, 10-30 mol%) were prepared by solution copolymerization in water. Methylene bisacrylamide and ammonium persulfate were used as crosslinker and initiator, respectively. Then, the synthesized copolymers were treated with HCl to produce allyl thiacalix[4]arene tetrasulfonic acid(ASTCAH) based alcogels. The obtained gels exhibited high ability for absorbing and retaining a variety of monohydric and polyhydric alcohols. Alcohol absorbency was improved with increase of ASTCA content in feeding of the gel. Characterization of sulfonated monomer (ASTCA) was performed using FTIR, 1 H and 13 C-NMR spectroscopies and the synthesized gels characterized by FTIR. Thermal and mechanical properties of these copolymers were also studied using TGA and DMTA. Glass transition temperature and storage modulus of the copolymer were increased with an increase of the ASTCA in the gel. Thermal stability was improved with an increase of ASTCA content in the copolymer.

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Section: Alcohol Absorbencysupporting

confidence: 68%

Section: Dmtasupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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Swelling behavior and characterization of alcohol-specific superabsorbing gels based on acrylic acid and allyl tetrasodium thiacalix[4]arene tetrasulfonate

Narimani

Lakouraj

2015

J Polym Res

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“…Rheological measurements of the water‐swollen gels (0.10 g sample in 2.3 mL distilled water) were performed using a Paar‐Physica Osillatory Rheometer (MCR300, Germany) at 25 °C with parallel plate geometry (plate diameter 25 mm, gap 3 mm). The detailed procedure can be found elsewhere …”

Section: Methodsmentioning

confidence: 81%

Synthesis and characterization of super dye adsorbent hydrogels based on acrylic acid and acryloyl tetrasodium thiacalix[4]arene tetrasulfonate

Narimani

Lakouraj

2015

Polymer International

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Acryloyl tetrasodium thiacalix[4]arene tetrasulfonate (ACSTCA) was synthesized via fictionalization of tetrasodium thiacalix[4]arene tetrasulfonate (STCA). Hydrogels based on acrylic acid (AA) (20-70 mol%) and ACSTCA (30-80 mol%) were prepared by solution copolymerization in water using methylene bisacrylamide and ammonium persulfate as crosslinker and initiator, respectively. The gels obtained exhibited a good ability for absorbing water. Swelling of the gels was improved with increase in ACSTCA content in the gel feed. Characterization of the synthesized monomer (ACSTCA) was performed using mass spectrometry and Fourier transform infrared (FTIR), 1 H and 13 C NMR spectroscopies and the synthesized gels were characterized by FTIR. The thermal and mechanical properties of these copolymers were also studied using TGA and dynamic mechanical thermal analysis. The glass transition temperature and storage modulus of the copolymer were increased with increasing content of ACSTCA in the gel. Thermal stability was improved with increasing ACSTCA content in the structure of the copolymer. The results showed that the synthesized copolymer (ACSTCA-AA) can effectively remove dye from wastewater. The dye removal capacity of the gels was investigated with a UV−visible spectrophotometer. In addition, the effect of key operation parameters such as the ACSTCA content in the structure of the copolymer, contact time, adsorbent dosage, pH of the solution and temperature on dye removal from aqueous solution was experimentally studied. The equilibrium data were analyzed using the Langmuir and Freundlich adsorption isotherms. The Freundlich isotherms provided a better fit to the data. Results from the kinetic studies revealed that the adsorption of malachite green onto the hydrogels followed a pseudo-second-order kinetic model.

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“…For P(NIPAM-SPA) particles, new bands appear at 1410 and 1098 cm −1 that can be attributed to stretching of SO 3 − from the newly introduced SPA. 22 Thermogravimetric analysis (TGA) allows a comparison of temperature profiles and the residual mass of different particles. The relative mass as a function of temperature for M-PVA, M-PNIPAM 17 kDa, and M-P(NIPAM-SPA) particles is shown in Figure 2 (right).…”

Section: Resultsmentioning

confidence: 99%

Temperature-Switchable Agglomeration of Magnetic Particles Designed for Continuous Separation Processes in Biotechnology

Paulus

Heinzler

Ooi

et al. 2015

ACS Appl. Mater. Interfaces

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The purpose of this work was the synthesis and characterization of thermally switchable magnetic particles for use in biotechnological applications such as protein purification and enzymatic conversions. Reversible addition-fragmentation chain-transfer polymerization was employed to synthesize poly(N-isopropylacrylamide) brushes via a "graft-from" approach on the surface of magnetic microparticles. The resulting particles were characterized by infrared spectroscopy and thermogravimetric analysis and their temperature-dependent agglomeration behavior was assessed. The influence of several factors on particle agglomeration (pH, temperature, salt type, and particle concentration) was evaluated. The results showed that a low pH value (pH 3-4), a kosmotropic salt (ammonium sulfate), and a high particle concentration (4 g/L) resulted in improved agglomeration at elevated temperature (40 °C). Recycling of particles and reversibility of the temperature-switchable agglomeration were successfully demonstrated for ten heating-cooling cycles. Additionally, enhanced magnetic separation was observed for the modified particles. Ionic monomers were integrated into the polymer chain to create end-group functionalized particles as well as two- and three-block copolymer particles for protein binding. The adsorption of lactoferrin, bovine serum albumin, and lysozyme to these ion exchange particles was evaluated and showed a binding capacity of up to 135 mg/g. The dual-responsive particles combined magnetic and thermoresponsive properties for switchable agglomeration, easy separability, and efficient protein adsorption.

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Overentrant swelling behaviour of poly(potassium, 3-sulfopropyl acrylate-acrylic acid) gels

Cited by 11 publications

References 28 publications

Swelling behavior and characterization of alcohol-specific superabsorbing gels based on acrylic acid and allyl tetrasodium thiacalix[4]arene tetrasulfonate

Swelling behavior and characterization of alcohol-specific superabsorbing gels based on acrylic acid and allyl tetrasodium thiacalix[4]arene tetrasulfonate

Synthesis and characterization of super dye adsorbent hydrogels based on acrylic acid and acryloyl tetrasodium thiacalix[4]arene tetrasulfonate

Temperature-Switchable Agglomeration of Magnetic Particles Designed for Continuous Separation Processes in Biotechnology

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