Non-Gaussian elasticity of swollen poly(N-isopropylacrylamide) gels at high charge densities

Gundogan, Nermin; Melekaslan, Demet; Okay, Oğuz

doi:10.1016/s0014-3057(03)00153-8

Cited by 22 publications

(13 citation statements)

References 21 publications

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“…The swelling degree of hydrogels depends not only on the nature of hydrogel and swelling medium, but also on the crosslink density. Many studies have been reported on thermosensitive hydrogels based on the monomer NIPAAm and its copolymers with most widely studied comonomer, such as acrylic acid, acrylamide [17][18] methyl-acrylamido propanesulfonic acid, sodium acrylate, sodium methacrylate [19], itaconic acid, maleic acid, N-isopropyl-maleamic acid [20][21].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, rheological behavior and swelling properties of copolymer hydrogels based on poly(N-isopropylacrylamide) with hydrophilic monomers

Seddiki¹,

Aliouche²

2013

Bull. Chem. Soc. Eth.

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ABSTRACT. In this study, hydrogels of poly(N-isopropylacrylamide-co-acrylamide) and poly(Nisopropylacrylamide-co-acrylic acid) having a thermoresponsive character were prepared by aqueous free-radical co-polymerization using the ammonium persulfate/N,N,N', N'-tetramethylethylenediamine (APS/TEMED) redoxpair initiator system in the presence of N,N'-methylenebisacrylamide (MBAAm) crosslinker. (NIPAAm-co-AAm) and (NIPAAm-co-AAc) hydrogels with different thermoresponsive properties were obtained by fixing the initial NIPAAm/AAm mole ratio and and (NIPAAm-co-AAc) mole ratio to 80/20 and changing the crosslinker concentration. The copolymers were characterized with infrared spectroscopy (IR) and differential scanning calorimetry (DSC) techniques. The swelling response of the copolymers networks as a function of time, temperature and swelling environment has been observed to be dependent on both structural aspects of the polymers and swelling environment. The swelling has been observed to be decrease with increase in MBAAm in the copolypolymers networks. Rheological behavior was studies in oscillatory module. All copolymers have a viscoelastic behaviour. We note that the elastic modulus G' increases with increasing hydrophilic monomers.

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Section: Introductionmentioning

confidence: 99%

Synthesis, rheological behavior and swelling properties of copolymer hydrogels based on poly(N-isopropylacrylamide) with hydrophilic monomers

Seddiki¹,

Aliouche²

2013

Bull. Chem. Soc. Eth.

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“…The filled symbols are data points for PNIPA hydrogels prepared at the same crosslinker ratio X and monomer concentration C 0 but by using AMPS as the ionic comonomer. 10,11 V eq increases as the SSA content of the hydrogel x i increases. This is a consequence of the osmotic pressure exerted by the counterions of SSA units in the network chains.…”

Section: Resultsmentioning

confidence: 98%

“…Experimental data for PNIPA gels prepared by using AMPS as the ionic comonomer are also shown in the figure by open symbols. 11 The solid curves in the figure are the best fitting curves to the data, which give scaling parameters 0.52 Ϯ 0.08 and 0.68 Ϯ 0.01, for SSA and AMPS hydrogels, respectively. The scaling parameter 0.52, thus found for the present hydrogels, is much smaller than the predicted value of 1.5 for Gaussian chains [eq.…”

Section: 18mentioning

confidence: 99%

“…[5][6][7][8][9] Recently, we investigated the elasticity of a series of PNIPA hydrogels with varying amounts of charged units derived from the sodium salt of 2-acrylamido-2-methylpropane sulfonic acid (AMPS). 10,11 It was shown that, even at low charge densities, the increase of the equilibrium gel volume with the gel charge density is considerably weaker than expected assuming Gaussian statistics. The results could be explained with the non-Gaussian form of the rubber elasticity theory.…”

Section: Introductionmentioning

confidence: 99%

“…The results could be explained with the non-Gaussian form of the rubber elasticity theory. 10,11 In the present work, we used 4-vinylbenzenesulfonic acid sodium salt (styrene sulfonate, SSA) instead of AMPS as the ionic comonomer of NIPA. Our aim was to increase the stiffness of the polymer backbone of ionic PNIPA gels by replacing AMPS with SSA units.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Swelling and elasticity of poly (N‐isopropylacrylamide‐co‐4‐vinyl benzene sulfonic acid sodium salt) hydrogels

Gundogan

Melekaslan

Okay

2004

J of Applied Polymer Sci

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Abstract:The mechanical properties and the swelling behavior of hydrogels based on N-isopropylacrylamide (NIPA) and 4-vinylbenzenesulfonic acid sodium salt (styrene sulfonate, SSA) monomers were investigated. The mole fraction of SSA in the comonomer feed varied between 0 and 1, whereas the crosslinker ratio was fixed at 1/85. Both the swelling and the elasticity data of the hydrogels swollen in water show that they are in the non-Gaussian regime. The exponents found for the charge density dependence of the equilibrium swelling ratio as well as for the volume dependence of the gel elastic modulus are in good agreement with the predicted course of the non-Gaussian elasticity of swollen hydrogels.

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Tuning the Synthetic Routes of Dimethylaminoethyl methacrylate‐Based Superabsorbent Copolymer Hydrogels Containing Sulfonate Groups: Elasticity, Dynamic, and Equilibrium Swelling Properties

Boyaci

Orakdöğen

2015

Adv Polym Technol

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Superabsorbent copolymer hydrogels based on N,N‐dimethylaminoethyl methacrylate (DMAEMA) and 2‐acrylamido‐2‐methylpropane sulfonic acid (AMPS) were synthesized by free‐radical cross‐linking copolymerization using a bifunctional cross‐linking agent diethylene glycol dimethacrylate (DEGDMA). Poly(DMAEMA‐co‐AMPS) (P(DMAEMA‐co‐AMPS)) hydrogels were prepared at a fixed cross‐linker ratio, but at various ionic comonomer AMPS content between 0 and 50 mol%. The effect of ionic comonomer concentration on the equilibrium swelling, mechanical behavior, and swelling–deswelling kinetics was investigated to find materials with satisfactory swelling and elastic properties. The increase in the ionic comonomer AMPS content increased the equilibrium swelling of copolymer hydrogels. Using the Flory–Rehner theory, the equilibrium swelling behavior of P(DMAEMA‐co‐AMPS) hydrogels was successfully investigated and the effective charge density of the resulting copolymer hydrogels was calculated as an adjustable parameter. Scaling rules were derived for the ionic group content to explain the observed swelling behavior of P(DMAEMA‐co‐AMPS) hydrogels. The kinetics of copolymer hydrogel swelling as well as the mechanism of diffusion was investigated by dynamic swelling measurements at different pH values. The dominant physical mechanism controlling the water uptake of P(DMAEMA‐co‐AMPS) copolymer hydrogels was analyzed, and the diffusion coefficients were determined. The transport was found to be less Fickian for the copolymer hydrogels containing AMPS below 30 mol% at acidic pH values where the polymer networks were ionized.

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Non-Gaussian elasticity of swollen poly(N-isopropylacrylamide) gels at high charge densities

Cited by 22 publications

References 21 publications

Synthesis, rheological behavior and swelling properties of copolymer hydrogels based on poly(N-isopropylacrylamide) with hydrophilic monomers

Synthesis, rheological behavior and swelling properties of copolymer hydrogels based on poly(N-isopropylacrylamide) with hydrophilic monomers

Swelling and elasticity of poly (N‐isopropylacrylamide‐co‐4‐vinyl benzene sulfonic acid sodium salt) hydrogels

Tuning the Synthetic Routes of Dimethylaminoethyl methacrylate‐Based Superabsorbent Copolymer Hydrogels Containing Sulfonate Groups: Elasticity, Dynamic, and Equilibrium Swelling Properties

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