Swelling behavior of poly(acrylamide-co-sodium acrylate) hydrogels in aqueous salt solutions: theory versus experiments

Okay, Oğuz; Sariişik, Safiye B.

doi:10.1016/s0014-3057(99)00058-0

Cited by 94 publications

(56 citation statements)

References 26 publications

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“…The swelling degree of the semi-IPN hydrogels in saline solutions was appreciably decreased as compared with the values measured in deionized water. This well-known phenomenon commonly observed in the swelling of ionizable hydrogels [31] was often attributed to the charge screening effect of the addition cations. Fig.…”

Section: Salt Effectmentioning

confidence: 92%

pH switching on-off semi-IPN hydrogel based on cross-linked poly(acrylamide-co-acrylic acid) and linear polyallyamine

Zhang

et al. 2005

Polymer

100

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Section: Salt Effectmentioning

confidence: 92%

pH switching on-off semi-IPN hydrogel based on cross-linked poly(acrylamide-co-acrylic acid) and linear polyallyamine

Zhang

et al. 2005

Polymer

100

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“…The influence of the electrolyte can be evaluated by the ideal Donnan equation, which gives rise to: [23] lnð1…”

Section: Thermodynamic Modelsmentioning

confidence: 99%

“…[ 23] Calculation indicates that not all the fixed charges inside the hydrogel are effective in hydrogel volume transition. The charge distribution of hydrogels also strongly affects the effective charge density and thus the volume transition behaviors.…”

Section: Effective Charge Densitymentioning

confidence: 99%

Modeling Investigation of Hydrogel Volume Transition

Chen

et al. 2004

Macro Theory & Simulations

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Summary: This paper provides an overview of the latest development in modeling and simulation of volume transition behaviors of hydrogels with models at both macroscopic and molecular levels. Energy conservation law, mass conservation law and momentum conservation law provide good starting points for developing models for hydrogel volume transition. Thermodynamic models, transport models, multiphasic mixture theory and molecular simulation are discussed. Thermodynamic models provide qualitative description of equilibrium volume transition of hydrogels. Both transport models and multiphasic mixture theory can predict transient and equilibrium volume transition of hydrogels. Molecular simulation provides mechanistic understanding of hydrogel volume transition. Several key parameters are summarized for future model development.

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“…Stimuli-sensitive hydrogels have the capability to change their swelling behavior, permeability, or mechanical strength in response to external stimuli such as small changes in pH, ionic strength, and temperature. [6,7] It has been shown that the swelling and shrinking of weak polyelectrolyte hydrogels in salt solutions are independent of the chemical species of salt ion, [8] whereas the swelling and shrinking behaviors of strong polyelectrolyte hydrogels are found to depend on the counterion species. [1,2,5] The charge of the hydrogels is important for dependence of their swelling and shrinking behaviors on the surrounding media.…”

Section: Introductionmentioning

confidence: 99%

Swelling–Shrinking Behavior of Poly(Acrylamide‐co‐itaconic Acid) Hydrogels in Water and Aqueous NaCl Solutions

Çaykara

Doğmuş

2005

Journal of Macromolecular Science, Part A

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Polyelectrolyte hydrogels containing diprotic acid moieties sensitive to ionic strength changes of the swelling medium were prepared from acrylamide (AAm) and itaconic acid (IA) monomers with 0 -21.4 mol% IA by using a radiation polymerization technique. The swelling and shrinking capacities of hydrogels were measured in water and in NaCl solutions. The equilibrium swelling ratio of hydrogels in water increased drastically when the mole percent of IA increased or NaCl concentration in the external solution decreased. The dynamics of the absorption process was investigated and found to be non-Fickian controlled. On the other hand, it was shown that the hydrogels with high IA content shrank significantly faster than the hydrogels with low IA content in 1.0 M NaCl solution.

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Swelling behavior of poly(acrylamide-co-sodium acrylate) hydrogels in aqueous salt solutions: theory versus experiments

Cited by 94 publications

References 26 publications

pH switching on-off semi-IPN hydrogel based on cross-linked poly(acrylamide-co-acrylic acid) and linear polyallyamine

pH switching on-off semi-IPN hydrogel based on cross-linked poly(acrylamide-co-acrylic acid) and linear polyallyamine

Modeling Investigation of Hydrogel Volume Transition

Swelling–Shrinking Behavior of Poly(Acrylamide‐co‐itaconic Acid) Hydrogels in Water and Aqueous NaCl Solutions

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