Swelling and mechanical behavior of ionized poly(acrylamide-co-N,N’-diethylacrylamide) gels in water/acetone mixtures and in water at various temperatures

Alenichev, Igor; Hanyková, Lenka; Ilavský, M.

doi:10.1007/s00289-006-0681-5

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…A sudden decrease in the gel volume occurs at a critical non-solvent concentration. This 1st order phase transition is given by a change of the chain conformation (Alenichev et al, 2007) and should not be confused with the glass transition phenomena. Ilavsky et al (Ilavsky, 1982;Ilavsky et al, 1995) found that, in poly(acrylamide) networks, the swelling was linearly related with the shear modulus according to the predicted rubber elasticity, even in the region of the critical non-solvent concentration.…”

Section: Introductionmentioning

confidence: 99%

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Effect of solvent-dependent viscoelastic properties of chitosan membranes on the permeation of 2-phenylethanol

Caridade

Silva

Reis

et al. 2009

Carbohydrate Polymers

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a b s t r a c tThe viscoelastic behaviour of chitosan was followed by dynamic mechanical analysis (DMA) while the sample was immersed in gradient compositions of water/ethanol mixtures. The swelling equilibrium of chitosan membranes, both crosslinked with genipin or not, increased linearly with the water content. Increasing the water content, it was simultaneously observed a peak in the loss factor (around 25 vol.%) and a reduction of the storage modulus, which was attributed to the a-relaxation of chitosan. This was the first time that the glass transition dynamics in a polymer was monitored in immersion conditions where the composition of the plasticizer in the bath is changed in a controlled way. The water content at which tan d presented a maximum increased with both increasing frequency and increasing crosslinking density. The permeability decreased steadily with the ethanol content, reaching very low values around the glass transition. Therefore we hypothesize that conformational mobility of the polymeric chains may play an important role in the diffusion properties of molecules trough polymeric matrices.

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Section: Introductionmentioning

confidence: 99%

“…A number of swollen gel systems are known to undergo a 1st order phase transition when immersed in miscible solvent/non-solvent liquids (Alenichev, Hanykova, & Ilavsky, 2007;Ilavsky, 1982;Ilavsky, Sedlakova, Bouchal, & Plestil, 1995). A sudden decrease in the gel volume occurs at a critical non-solvent concentration.…”

Section: Introductionmentioning

confidence: 99%

Effect of solvent-dependent viscoelastic properties of chitosan membranes on the permeation of 2-phenylethanol

Caridade

Silva

Reis

et al. 2009

Carbohydrate Polymers

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“…Hydrogels are three‐dimensional crosslinked hydrophilic polymers or copolymers that swell in water to equilibrium. Controllable volume change occurs in response to small variations of pH, temperature, or ionic strength 1−4. In addition, hydrogels were the key role in vast number of applications such as microsensors/actuators,5 super absorbent polymers,6 production of contact lenses,7 preparation of an antigen‐sensitive hydrogel,8 molecularly imprinted hydrogels that exhibit chymotrypsin‐like activity,9 and in “click chemistry.”10 One interesting hydrogel use in drug delivery systems was as drug vehicles, where due to hydrogel structure, delayed release of drugs at certain environment, position and/or time may take place 11, 12.…”

Section: Introductionmentioning

confidence: 99%

Stimuli pH‐responsive (N‐vinyl imidazole‐co‐acryloylmorpholine) Hydrogels; Mesoporous and Nanoporous Scaffolds

Fares

Shboul

2012

J Biomedical Materials Res

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Tunable mesoporosity and nanoporosity of stimuli pH-responsive (N-vinyl imidazole-ran-acryloylmorpholine) hydrogels studied in terms of %swelling at various ionic strength, pH, temperature, and crosslinker concentration values were investigated. Hydrogel properties including diffusional exponent, number of links between two crosslinks, rms end-to-end distance and mesh size of gels were evaluated. The structural sequence of the scaffolds was tested and verified using Kelen-Tudos technique, and Alfrey-Price relationship. Hydrogels were characterized using FTIR, thermogravimetric analysis, differential scanning calorimetry, and freeze-dried Scanning electron micrographs techniques. The reversible pH responsiveness and possible mesoporous and nanoporous (i.e., 0.88-4.03 nm) structures suggest their suitable candidate in membrane technology and/or is an adequate drug delivery vehicle in drug delivery systems.

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Gels and microgels for nanotechnological applications

Fernández-Barbero¹,

Suarez²,

Sierra‐Martin³

et al. 2009

Advances in Colloid and Interface Science

152

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Swelling and mechanical behavior of ionized poly(acrylamide-co-N,N’-diethylacrylamide) gels in water/acetone mixtures and in water at various temperatures

Cited by 5 publications

References 22 publications

Effect of solvent-dependent viscoelastic properties of chitosan membranes on the permeation of 2-phenylethanol

Effect of solvent-dependent viscoelastic properties of chitosan membranes on the permeation of 2-phenylethanol

Stimuli pH‐responsive (N‐vinyl imidazole‐co‐acryloylmorpholine) Hydrogels; Mesoporous and Nanoporous Scaffolds

Gels and microgels for nanotechnological applications

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