Characterization of structured acrylamide/acrylic acid hydrogels by TMDSC and microscopy

Orozco-Guareño, Eulogio; Almaraz, A. N. Campos; Reyes, Gloria; López-Ureta, Luz C.; González-Álvarez, Alejandro

doi:10.1007/s10973-005-7449-2

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…The resulting solution was fed into a 0.5 L rectangular reactor and the pH was adjusted to 7 with a 0.2 M KOH solution. This mixture was stirred for 5 min and left to rest at 268 K for 24 h to control monomers side reactions in the redox polymerization process . Then, 3 mL of potassium persulfate (0.148 M ) solution and ammonium bisulfite (0.124 M NH 4 HSO 3 ) were added to the mixture and heated to 318 K for 2 h using a controlled temperature bath (LAUDA model E100).…”

Section: Methodsmentioning

confidence: 99%

Polymeric hydrogels obtained using a redox initiator: Application in Cu(II) ions removal from aqueous solutions

Morán-Quiroz

Orozco-Guareño

Manríquez

et al. 2013

J of Applied Polymer Sci

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Poly(acrylic acid-co-acrylamide) hydrogels were prepared via free-radical solution polymerization, crosslinked with ethylene-glycol-dimethacrylate, potassium persulfate/ammonium bisulfite as the initiator, and applied in the removal of Cu(II) ions from aqueous solutions. Molar ratios of acrylamide/acrylic acid moieties and the amount of crosslinking agent were varied to determine the swelling capacities of hydrogels and maximum metal uptake. Polymerization kinetics was investigated by 1 H-NMR. Hydrogel physicochemical properties were characterized by nitrogen sorption measurements, elemental analysis, FTIR, and X-ray photoelectron spectroscopy (XPS). Swelling results indicated that hydrogels were swollen up to 27,500%. Hydrogels showed equilibrium Cu(II) adsorption capacities of 211.7 mg g 21 and fast kinetics ($20 min). Langmuir isotherm fitted adsorption equilibrium data. FTIR and XPS results helped in elucidating the presence of monodentate copper complex on the surface of hydrogels. A simple synthesis route of hydrogels using the redox initiator suggests the potential application in the removal of toxic metals from aqueous streams. V C 2013Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39933.

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Section: Methodsmentioning

confidence: 99%

Polymeric hydrogels obtained using a redox initiator: Application in Cu(II) ions removal from aqueous solutions

Morán-Quiroz

Orozco-Guareño

Manríquez

et al. 2013

J of Applied Polymer Sci

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show abstract

“…In general, microscopic sponges or systems retains and delivers diverse chemical substances. 1 Polymeric hydrogels have many applications and are currently used in hygienic products, paints, food, agriculture, electronic devices, molecular filters and drug delivery systems. [2][3][4][5][6][7] These multistructured hydrogels are hydrophilic, elastic, water insoluble, soft polymers with an anisotropic optical response.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and water state characterization of polysodium acrylate/cellulose microfibril hydrogels

Anbudayanidhi

Nayak

Mohanty

2013

Journal of Thermoplastic Composite Materials

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The structure of polysodium acrylate (PSA) hydrogel was modified using N,Nmethylenebisacrylamide and cellulose microfibrils (CMFs) as a cross-linker and filler, respectively. CMF was obtained from banana fiber by acid hydrolysis process. The resulting structure and morphology of CMF and PSA/CMF hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD) analysis and scanning electron microscopy. From the FTIR and XRD spectra, the formation of CMF from banana fiber is confirmed. Differential scanning calorimetric study was carried out on the swollen PSA/CMF hydrogels to determine the state and quantification of water present inside the hydrogels. The mechanical characterization of PSA/CMF hydrogels was studied in brief by dynamic mechanical analysis technique.

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Synthesis and characterization of acrylamide/acrylic acid hydrogels crosslinked using a novel diacrylate of glycerol to produce multistructured materials

López-Ureta

Orozco-Guareño

Cruz-Barba

et al. 2008

J. Polym. Sci. A Polym. Chem.

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In this work we propose a new crosslinking agent and the method to use it for the synthesis of acrylate based hydrogels. The use of this diacrylate of glycerol, synthesized in our laboratory, allows the generation of materials with well defined micro‐structures in the dry state, unique meso‐ and macro‐structures during swelling, and enhanced mechanical properties and swelling capacity in water. These properties depend on the crosslinking agent concentration, as well as synthesis thermal history. Poly(acrylamide‐co‐acrylic acid) hydrogels are commonly crosslinked with N, N′‐methylenebisacrylamide or N‐isopropylacrylamide. Here we obtain and use a new crosslinking agent, obtained from the reaction between glycerol and acrylic acid to produce a Diacrylate of glycerol (DAG). Two synthesis methods at equivalent molar ratio of acrylamide/acrylic acid (AM/AA) were analyzed. The mechanical properties, the swelling capacity, and the morphology at microscale of these hydrogels showed a well defined transition at a critical concentration of crosslinking agent. DAG induces the generation of hydrogels with hierarchichal structure. The micro‐structure surface morphology was investigated by scanning electron microscopy, the meso‐structure by polarized light microscopy and the macro‐structure by CCD imaging. The hydrogels with hierarchical structures showed improved mechanical properties when compared with structureless hydrogels. Control of the microstructure allows the generation of materials for different applications, i.e. templates or smart materials that interact with electromagnetic radiation. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 2667–2679, 2008

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Characterization of structured acrylamide/acrylic acid hydrogels by TMDSC and microscopy

Cited by 5 publications

References 32 publications

Polymeric hydrogels obtained using a redox initiator: Application in Cu(II) ions removal from aqueous solutions

Polymeric hydrogels obtained using a redox initiator: Application in Cu(II) ions removal from aqueous solutions

Synthesis and water state characterization of polysodium acrylate/cellulose microfibril hydrogels

Synthesis and characterization of acrylamide/acrylic acid hydrogels crosslinked using a novel diacrylate of glycerol to produce multistructured materials

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