Synthesis and characterization of acrylamide–acrylic acid hydrogels and adsorption of some textile dyes

Duran, Sibel; Şolpan, Dilek; Güven, Olgun

doi:10.1016/s0168-583x(99)00151-2

Cited by 98 publications

(43 citation statements)

References 11 publications

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“…Superabsorbent hydrogels of poly(acrylamide-co-acrylic acid) characterized mainly by fast swelling and pH swelling dependence, ionic strength and composition have been prepared by a number of authors [12][13][14]. These materials have been proposed for different applications, such as waste water purification from textile industry [15], for the environmental analysis of Cu and Cd [16] and as mechanical transducers [17].…”

Section: Introductionmentioning

confidence: 99%

Interpenetrated Chitosan-Poly(Acrylic Acid-Co-Acrylamide) Hydrogels. Synthesis, Characterization and Sustained Protein Release Studies

Povea¹,

Argüelles‐Monal²,

Cauich-Rodríguez³

et al. 2011

MSA

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Interpenetrated polymer networks of chitosan (CHI), polyacrylic acid (PAA) and polyacrylamide (PAM) were prepared by free radical polymerization. These hydrogels were either washed with double distilled water (CHI/PAA/PAM) A or hydrolyzed with 1M sodium hydroxide (NaOH), (CHI/PAA/PAM) S. Both types of hydrogels were characterized by infrared spectroscopy, microstructural techniques and compressive mechanical testing. Finally, hydrogels were loaded with bovine serum albumin (BSA) and release followed at different pHs. Infrared spectra analysis showed correspondence between hydrogels and monomer feed compositions. Hydrolyzed hydrogels, had increased water content and pH swelling dependence. Compression modulus of swelled hydrolyzed hydrogels decreased with increasing equilibrium water content. Higher BSA loadings were achieved on hydrolyzed hydrogels due to their high water content and porosity. Protein release from hydrogels was low ( 20% after 10 hours) at pH 1.2, but sustained release was observed at pH 6.8 and 7.4. The integrity of the protein released at 6.8 and 7.4 by hydrolyzed hydrogels was unaffected. The hydrogles showed no cytotoxic effects on human skin dermal fibroblasts as determined by MTT assay except for two compositions of (CHI/PAA/PAM) A samples, which after seven days presented a viability lower than 80% respect to the control.

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Section: Introductionmentioning

confidence: 99%

Interpenetrated Chitosan-Poly(Acrylic Acid-Co-Acrylamide) Hydrogels. Synthesis, Characterization and Sustained Protein Release Studies

Povea¹,

Argüelles‐Monal²,

Cauich-Rodríguez³

et al. 2011

MSA

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“…The presence of AAc (pK a,AAc = 4.25) lends the hydrogel its pH responsiveness, as the swelling volume correlates with the degree of ionization of the hydrogel network. [26] At pH >4.25, the AAc is ionized, which leaves the hydrogel polymer backbone with a net charge (Figure 1a). Dissociated hydrogen ions remain in the hydrogel to balance this negative charge which in turn causes increased osmotic pressure, ultimately leading to water infiltration and hydrogel swelling.…”

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confidence: 99%

Bio‐inspired Design of Submerged Hydrogel‐Actuated Polymer Microstructures Operating in Response to pH

2011

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Responsive and reversibly actuating surfaces have attracted significant attention recently due to their promising applications as dynamic materials [1] that may enable microfluidic mixing, [2] particle propulsion and fluid transport, [3] capture and release systems, [4] and antifouling. [5] Analogs in nature serve as inspiration for the design of such advanced adaptive materials systems⎯microorganisms use flagella for propulsion, [6] cilia line the human respiratory tract to sweep mucus from the lungs and prevent bacterial accumulation, [7] and echinoderms use pedicellariae for body cleaning and food capture. [8] Significant characteristics of these biological systems include functionality in a fluidic environment, controllable actuation direction or pattern, and the ability to translate chemical signals or stimulus into mechanical motion. Researchers have taken various approaches to fabricating biomimetic actuators, among which are biomorph actuators made using Micro Electromechanical Systems (MEMS) technology, [9] magnetically actuated poly(dimethylsiloxane) (PDMS) structures, [10] and artificial cilia or actuators made from responsive gel. [11,12] However, most fabricated actuators, such as MEMS or magneticallyactuated PDMS posts, must be driven by an external force or field and are not responsive to chemical stimuli. Actuating structures that have been made from responsive hydrogel are Submitted to 2 either low aspect ratio and their motion is not patternable, [11] or the movement is irreversible. [12] Microscale actuation systems which exhibit reversible chemo-mechanical response and control of actuation direction or pattern have proven difficult to achieve.Inspired by biological actuators, which can be broadly interpreted as composites consisting of an active "muscle" component coupled with a passive "bone" structure, we recently developed a hybrid actuation system in which a crosslinked acrylamide-based hydrogel, acting as an analog to muscle, drives the movement of embedded silicon [13,14] or polymer [15] microposts, serving as analogs to skeletal elements. Actuation was achieved by the swelling and contraction of the humidity-responsive gel upon hydration/drying. Actuation direction was controlled by modulating the hydrogel thickness; since thicker hydrogel exhibits a greater absolute change in volume than thin hydrogel, the forces exerted on the structures⎯and thus their actuation direction⎯can be patterned.However, a humidity responsive system will not function in the fluidic environment required for many applications such as propulsion, cargo transport, or microfluidics, and it is difficult to pattern uni-directional actuation of posts over large areas due to their lack of preferred bending direction. To enable the actuators to function in various environments, it is possible to alter the chemistry of the hydrogel muscle to make it shrink or swell while submerged in response to a range of stimuli including light, [16] temperature, [17] biomolecules (e.g. glucose), [18] or pH. [19] To gain additional ...

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“…Functional groups within the polymeric matrix produce complex structures through hydrogen bonding, which finally binds metal ions and other environmental pollutants to the hydrogel's backbone. Methods derived to use acrylamide-co-acrylic acid hydrogel for the absorption of some textile dyes 1 and removal of traces of Cu and Cd from environmental water samples 9 have a good agreement in this regard. Two polymers with different properties form a stable combination state by interpenetrating networks, and a hydrogel obtained as a result of a combination of one polymer having hydrophilic and a second having nonionic functional groups possess salt resisting properties.…”

Section: Introductionmentioning

confidence: 95%

“…Hydrophilicity or high water retention of hydrogels is attributed to the presence of hydrophilic groups, such as carboxylic acids, amides, alcohols, and so on. 1 Synthesis of such types of material is useful for applications in numerous areas, such as agriculture, environment, medicine, and so on. Highly swellable poly(ethylene oxide) based hydrogels were found suitable to apply in saline land for the growth of certain horticultural crops.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of copolymeric acrylamide/potassium acrylate hydrogels blended with poly(vinyl alcohol): Effect of crosslinking and the amount of poly(vinyl alcohol) on swelling behavior

Ali

Zaidi

2005

J of Applied Polymer Sci

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ABSTRACT:A novel series of copolymeric acrylamide/ potassium acrylate superabsorbents, blended with poly(vinyl alcohol), have been synthesized by using N, NЈ-methylenebisacrylamide as a crosslinker and potassium persulphate (K 2 S 2 O 8 ) as an initiator. Swelling behavior of these hydrogels in water was investigated; and on the basis of swelling properties, the diffusional behavior of water into these hydrogel systems was analyzed. It was observed that with the increase of amount of poly(vinyl alcohol) or crosslinking, the swelling of the hydrogels decreased. The hydrogel synthesized by addition of 5% poly(vinyl alcohol) and 0.25% crosslinking showed maximum swelling of 54445%.

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Synthesis and characterization of acrylamide–acrylic acid hydrogels and adsorption of some textile dyes

Cited by 98 publications

References 11 publications

Interpenetrated Chitosan-Poly(Acrylic Acid-Co-Acrylamide) Hydrogels. Synthesis, Characterization and Sustained Protein Release Studies

Interpenetrated Chitosan-Poly(Acrylic Acid-Co-Acrylamide) Hydrogels. Synthesis, Characterization and Sustained Protein Release Studies

Bio‐inspired Design of Submerged Hydrogel‐Actuated Polymer Microstructures Operating in Response to pH

Synthesis of copolymeric acrylamide/potassium acrylate hydrogels blended with poly(vinyl alcohol): Effect of crosslinking and the amount of poly(vinyl alcohol) on swelling behavior

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