Swelling of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mi mathvariant="normal">H</mml:mi></mml:mrow></mml:math>-sensitive hydrogels

Drozdov, Aleksey D.; Christiansen, Jesper de Claville

doi:10.1103/physreve.91.022305

Cited by 42 publications

(25 citation statements)

References 46 publications

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“…When pH is in the mid‐range (5.5

\leq

\leq

9),

Q_{t}

increases monotonically with time since pH is higher than the dissociation constant for carbopols (

normalp K_{a} = 6 \pm 0.5

). This increase in swelling can be explained by deprotonation of carboxyl groups attached to the backbone of polymer networks . Finally, at low pH values (pH

\leq 3.5

), hybrid gels depict either a nonmonotonic or monotonic shrinkage with respect to their corresponding

Q_{0}

.…”

Section: Resultsmentioning

confidence: 97%

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Nonmonotonic swelling of agarose‐carbopol hybrid hydrogel: Experimental and theoretical analysis

Hamzavi

Dewavrin

Drozdov

et al. 2017

J Polym Sci B Polym Phys

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A hybrid gel is synthesized by physical mixing of agarose and carbopol and an interpenetrating network of Agarose‐Carbopol (AC) hybrid gel is observed by atomic force microscopy. This hybrid gel exhibits pH‐responsiveness and mechanical stability as well as tunable swelling. These hydrogels depict a nonmonotonic swelling behavior as a function of pH. In particular, the equilibrium degree of swelling increases with pH of bath solution until its maximum value around pH = 7–9, followed by a decrease at higher pH values. The degree of swelling is increased by the concentration of carbopol when the concentration of agarose is low [ 0.25% true(w/vtrue)], or decreased by the concentration of agarose when Cagarose is high [ >0.5% true(w/vtrue)]. A physics‐based model is also adapted to characterize the swelling‐shrinking behavior of different compositions of AC gels. This swelling‐shrinking behavior of AC hydrogels will have potential applications in smart hydrogel‐based devices. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 444–454

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“…When pH is in the mid‐range (5.5

\leq

\leq

9),

Q_{t}

increases monotonically with time since pH is higher than the dissociation constant for carbopols (

normalp K_{a} = 6 \pm 0.5

). This increase in swelling can be explained by deprotonation of carboxyl groups attached to the backbone of polymer networks . Finally, at low pH values (pH

\leq 3.5

), hybrid gels depict either a nonmonotonic or monotonic shrinkage with respect to their corresponding

Q_{0}

.…”

Section: Resultsmentioning

confidence: 97%

“…This increase in swelling can be explained by deprotonation of carboxyl groups attached to the backbone of polymer networks. 42 Finally, at low pH values (pH 3:5), hybrid gels depict either a nonmonotonic or monotonic shrinkage with respect to their corresponding Q 0 .…”

Section: Transient Swelling Of Different Compositions Of Ac Hybrid Gelsmentioning

confidence: 99%

Nonmonotonic swelling of agarose‐carbopol hybrid hydrogel: Experimental and theoretical analysis

Hamzavi

Dewavrin

Drozdov

et al. 2017

J Polym Sci B Polym Phys

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“…Jahren et al developed a model to predict pH dependent equilibrium swelling behavior of polyelectrolyte chitosan by using Flory and Tanaka swelling theory, however the absolute degree of swelling from the model was higher than found experimentally. Drozdov et al . derived a model for the elastic response of polyelectrolyte gels.…”

Section: Introductionmentioning

confidence: 99%

“…Hamzavi et al . proposed a model to capture the inhomogeneous swelling of the dual stimuli‐responsive core‑shell microgels with extending the model for pH‐responsive hydrogels by Drozdov …”

Section: Introductionmentioning

confidence: 99%

“…Jahren et al 35 developed a model to predict pH dependent equilibrium swelling behavior of polyelectrolyte chitosan by using Flory and Tanaka 36 swelling theory, however the absolute degree of swelling from the model was higher than found experimentally. Drozdov et al 37,38 derived a model for the elastic response of polyelectrolyte gels. They used the van't Hoff law for ionic pressure and Henderson-Hasselbach for ionization of chains to derive constitutive equations by means of free energy imbalanced inequality.…”

Section: Introductionmentioning

confidence: 99%

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Dual stimuli responsive neutral/cationic polymers/clay nanocomposite hydrogels

Amjadi

Sirousazar

Kokabi

2019

J of Applied Polymer Sci

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In this work, a thermodynamic‐based equilibrium‐swelling model was proposed to predict the swelling process of neutral/cationic polymers‐clay nanocomposite hydrogels sensitive to dual stimuli temperature and pH. Indeed, the new swelling model can estimate the effect of the rigid clay nanoparticles component on swelling behavior of blend nanocomposite hydrogels. The mixing term in model was developed based on lattice theory by considering the effects of solvent‐polymers, solvent‐clay, and polymer‐clay interaction parameters. The influence of the ionic groups of the clay layers and cationic polymer on the swelling was also taken into account in the proposed model. The model was verified by preparation of polyvinyl alcohol/chitosan/montmorillonite intelligent nanocomposite hydrogel by tripolyphosphate crosslinking method followed by freezing–thawing process. It was found that it could give good prediction for the equilibrium swelling of polymer‐clay nanocomposite hydrogels in the case of phantom network, especially where the swelling temperature and clay loading level are high and the pH of swelling medium is low. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48797.

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