Synthesis of Polyelectrolyte Gels with Embedded Voids Having Charged Walls

Starodubtsev, S. G.; Khokhlov, Alexei R.

doi:10.1021/ma035622u

Cited by 13 publications

(11 citation statements)

References 7 publications

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“…Further analyses have shown that this effect increases strongly with the increase of the charge of the co-ions. [8] For multivalent ions at low ionic strength, practically all of the co-ions are concentrated in the voids. Due to the condition of electroneutrality, the ions charged oppositely to multivalent co-ions are also present in the voids.…”

Section: Discussionmentioning

confidence: 99%

“…Contrary to ref., [6] charged monomer units in these gels are homogeneously distributed, so that direct comparison with the theory of ref. [7,8] is possible. Our aim thus is the study of partition of organic multivalent ions between water and polymer matrix, and comparison with theoretical results of ref.…”

Section: Discussionmentioning

confidence: 99%

“…Our aim thus is the study of partition of organic multivalent ions between water and polymer matrix, and comparison with theoretical results of ref. [7,8] Experimental Part Benzene and cyclohexyl bromide were of fine chemical grade (>99.0 wt.-%). Water was of Millipore quality.…”

Section: Discussionmentioning

confidence: 99%

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Synthesis and Properties of Polyelectrolyte Gels with Embedded Voids

Komarova

Starodubtsev

Khokhlov

2005

Macro Chemistry & Physics

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Summary: “Swiss‐cheese” polyelectrolyte gels, i.e., gels containing isolated voids filled with water were synthesized and studied. The gels were obtained by three‐dimensional copolymerization of neutral and charged monomers in the presence of oil/water emulsion stabilized by ionic surfactant. After removal of the surfactant and droplets of oil from the gel, the latter contains voids surrounded with charged swollen polymer network. Experiments were performed with slightly cross‐linked gels of copolymers of sodium‐2‐acrylamide‐2‐methyl‐1‐propanesulfonate with acrylamide. The gel containing voids absorbs much more anionic dyes than the control gel with the same chemical composition of the network obtained in homogeneous solution. This effect is due to strongly inhomogeneous distribution of the low molecular weight anions between the voids and the anionic matrix of the gel. The study of diffusion of the dyes in the gels with and without voids and of the kinetics of their swelling and collapse shows that the voids in the gel are isolated.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Synthesis and Properties of Polyelectrolyte Gels with Embedded Voids

Komarova

Starodubtsev

Khokhlov

2005

Macro Chemistry & Physics

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“…These systems are expected to be of significant practical interest as effective drug delivery systems 11. Besides, these composites were used for the preparation of polyelectrolyte networks containing voids or channels, so called “swiss‐cheese” gels 12–14. As it was showed, polymer matrix of composite gels can be formed either by the network of cross‐linked synthetic polymers, for instance, poly(acrylamide),12,13 or by physical gels, for instance, agarose‐based 15.…”

Section: Introductionmentioning

confidence: 99%

Intelligent gels and cryogels with embedded emulsions of various oils

Komarova

Starodubtsev

Lozinsky

et al. 2012

J of Applied Polymer Sci

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Thermo-responsive gels and cryogels with embedded microdroplets of Vaseline, olive, peanut, and linseed oils and their mixtures with hydrophobic dye Sudan 3 have been synthesized and studied. These composite gel matrices were obtained by the threedimensional copolymerization of N-isopropylacrylamide and N, N'-bis(acryloyl)cystamine in the presence of oil emulsions stabilized with sodium dodecylsulfate or Span 80. Polymerization was performed at room temperature for conventional gels and at À15 C for cryogels. It was shown that all synthesized systems exhibit heat-induced collapse at temperatures higher then 34 C. For conventional gels prepared at room temperature shrinking lasts within 20 to 80 min in accordance with gel composition. No squeezing of oil droplets was observed. In the case of cryogels, shrinking was accompanied by release of oils and response time was significantly shorter, about tens of seconds. Collapse character and release of lipophilic phase did not depend on the chemical nature of oils, dissolved compounds, and surfactant used for emulsion stabilization.

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“…Gels with entrapped magnetic particles are responsive to magnetic fields [6], gels containing clays have improved mechanical and adsorption properties [7]. Gels having isolated pores filled with water effectively trap linear macromolecules [8] and low-molecular-weight multi-charged ions [9][10]. Nevertheless, together with these advantages, the extensive study of smart gels demonstrated principal imperfections hampering their applications.…”

Section: Introductionmentioning

confidence: 99%

Structural design of PNIPA-based intelligent hydrogels via porous silica templates

et al. 2011

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Intelligent temperature-sensitive hydrogels have been synthesized using a hierarchically organized, porous silica gel as template. The organic gels were obtained by three-dimensional copolymerization of N-isopropylacrylamide and N,N'-bis(acryloyl)cystamine in the free volume of a monolith of a porous silica gel. After characterization, the silica matrix was dissolved in alkali. Unexpectedly, the remaining organic polymer showed similar properties to a gel obtained in homogeneous solution. The shape of the inorganic mould was retained in the purely organic hydrogel even after dissolution of the inorganic part and it showed the ability to collapse under enhanced temperatures. The collapse rate of the gel prepared via the template synthesis was much higher compared to gels prepared conventionally.

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Synthesis of Polyelectrolyte Gels with Embedded Voids Having Charged Walls

Cited by 13 publications

References 7 publications

Synthesis and Properties of Polyelectrolyte Gels with Embedded Voids

Synthesis and Properties of Polyelectrolyte Gels with Embedded Voids

Intelligent gels and cryogels with embedded emulsions of various oils

Structural design of PNIPA-based intelligent hydrogels via porous silica templates

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