Phase transition in swollen gels. 2. Effect of charge concentration on the collapse and mechanical behavior of polyacrylamide networks

Ilavský, M.

doi:10.1021/ma00231a019

Cited by 276 publications

(137 citation statements)

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“…1978) and light scattering (Geissler et al, 1988), and investigations of mechanical properties (Geissler et al, 1988;Hasa and Janacek, 1967;Janacek and Rasa, 1966;Oppermann et aI., 1985;Ilavsky and Hrouz, 1983). In general, experimental 3 observations are consistent with the concept of increasing chain interpenetration with rising %T.…”

mentioning

confidence: 74%

“…These studies include swelling investigations (Geissler et al, 1988;Hasa and Janacek,· 1967;Janacek and Hasa, 1966;Oppermann et al, 1985;Katayama et aI., 1993;Ilavsky and Hrouz, 1983;Hooper et aI.. 1990), analyses of microstructure via electron microscopy (RUchel et al. 1978) and light scattering (Geissler et al, 1988), and investigations of mechanical properties (Geissler et al, 1988;Hasa and Janacek, 1967;Janacek and Rasa, 1966;Oppermann et aI., 1985;Ilavsky and Hrouz, 1983).…”

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confidence: 99%

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Effect of Initial Total Monomer Concentration on the Swelling Behavior of Cationic Acrylamide-Based Hydrogels

Baker¹,

Hong²,

Blanch³

et al. 1994

Macromolecules

191

123

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The aqueous equilibrium swelling properties of a series of lightly-cross-linked cationic hydrogels based on acrylamide and [ (methacrylamido)propylj trimethylammonium chloride (MAPTAC) were measured as a function of initial total monomer concentration % T (w/v) and ionic strength. Swelling is a strong decreasing function of rising % T; the 10 % T hydrogel obtained a 17-fold larger swelling ratio (g of swollen hydrogel/g of dry hydrogel) in pure water compared to the 40 % T hydrogel. Good agreement is obtained between measured swelling equilibria in aqueous sodium chloride and that calculated from a Flory-type swelling model including ideal Donnan equilibria provided that an adjustable parameter is introduced into the swelling model for hydrogels in pure water. The experimental results presented here indicate that networkchain interpenetration increases with rising % T.

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mentioning

confidence: 74%

mentioning

confidence: 99%

Effect of Initial Total Monomer Concentration on the Swelling Behavior of Cationic Acrylamide-Based Hydrogels

Baker¹,

Hong²,

Blanch³

et al. 1994

Macromolecules

191

123

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show abstract

“…In recent years increasing attention has been focused on polymeric systems and gels based on N-alkylacrylamide, for their well-known properties of thermoreversible swelling or collapse, and for their possible application as drug release systems, chemo-mechanical transducers, sensors, and selective pumps (1)(2)(3)(4)(5). Polymer gelation can also be controlled by parameters other than temperature, e.g., pH, ionic strength, and solvent composition (6)(7)(8).…”

Section: [Traduit Par La Rcdaction]mentioning

confidence: 99%

Photomodulation of the hydrophilic properties of acrylic polymers containing side-chain azobenzene chromophores

Tirelli¹,

Altomare²,

Ciardelli³

et al. 1995

Can. J. Chem.

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Partially hydrophilic polymers have been prepared by free-radical copolymerization of trans-4-acryloyloxyazobenzene with N-tert-butylacrylamide and N-isopropylacrylamide. A turbidimetric method has been adapted to investigate the dependence of the polymer hydrophilic-hydrophobic balance on chemical composition and extent of photoisomerization of side-chain azobenzene chromophores. Irradiation at 366 nm of polymer suspension in THF-water induces the isomerization of azobenzene groups from the planar apolar trans form to the nonplanar polar cis form. Correspondingly, the solution turbidity is appreciably modified. Experimental results are discussed in terms of polymer structural parameters. Suspension stability and the possibility of canying out photochemical cycles have been also investigated.Key words: photochromic polymers, photoresponsive polymer, photomodulation of polymer properties, azobenzene-containing polymers, acryloyloxyazobenzene, N-tert-butylacrylamide.Rksumk : On a prCpart des polymkres partiellement hydrophiles par copolymCrisation radicalaire du trans-4-acryloxyazobenzkne avec les N-tert-butylacrylarnide et N-isopropylacrylamide. On a adapt6 une mCthode turbidimktrique pour Ctudier la dCpendance de la balance hydrophile-hydrophobe sur la composition chimique et le degrC de photoisomCrisation de la chaine latCrale des chromophores azobenzknes. L'irradiation, 2i 360 nm, d'une suspension de polymkre dans un melange THF-eau induit une isomCrisation des groupes azobenzknes de la forme trans, plane et apolaire, vers la forme cis, non planaire et polaire. D'une faqon correspondante, la turbiditt de la solution est modifiee d'une faqon appreciable. On discute des risultats expCrimentaux en fonction des paramktres structuraux du polymkre. On a CtudiC la stabilitt de la suspension et la possibilitC d'effectuer des cycles photochimiques.Mots elks : polymkres photochromes, polymkre photorepondant, photomodulation des propriCtCs d'un polymkre, polymkres contenant de l'azobenzkne, acryloxyazobenzkne, N-tert-butylacrylamide. [Traduit par la rCdaction]In recent years increasing attention has been focused on polymeric systems and gels based on N-alkylacrylamide, for their well-known properties of thermoreversible swelling or collapse, and for their possible application as drug release systems, chemo-mechanical transducers, sensors, and selective pumps (1-5). Polymer gelation can also be controlled by

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“…Their phase transition behavior is generally known to depend on the changes of external conditions such as temperature [2][3][4], pH [5], solvent composition [5][6][7][8], and so forth. Hydrogels have been extensively utilized in the biomedical [9][10][11], pharmaceutical [12][13][14], and related fields.…”

Section: Introductionmentioning

confidence: 99%

Phase Transition Behavior of Poly(N-isopropylacrylamide-co-N,Ndimethylaminopropylacrylamide) Hydrogels

Kang

Hong

Kim

et al. 2017

Eurasian Chem. Tech. J.

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The copolymer hydrogel of N-isopropylacrylamide (NIPAAm) and N,N-dimethylaminopropylacrylamide (DMAPAA) was synthesized by free radical copolymerization. The phase transition behavior of p(NIPAAmco-DMAPAA) hydrogels as a function of temperature and SDS concentration was studied. The p(NIPAAmco-DMAPAA) hydrogels exhibited larger swelling capacity than the homo p(NIPAAm) hydrogel. The phase transition temperature of p(NIPAAm-co-DMAPAA) hydrogels increased with an increase of DMAPAA content. In aqueous SDS solution, the swelling capacity of p(NIPAAm-co-DMAPAA) hydrogel decreased with an increase of SDS concentration. The phase transition temperature of p(NIPAAm-co-DMAPAA) hydrogels was found to be almost independent of the SDS concentration.

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Phase transition in swollen gels. 2. Effect of charge concentration on the collapse and mechanical behavior of polyacrylamide networks

Cited by 276 publications

References 8 publications

Effect of Initial Total Monomer Concentration on the Swelling Behavior of Cationic Acrylamide-Based Hydrogels

Effect of Initial Total Monomer Concentration on the Swelling Behavior of Cationic Acrylamide-Based Hydrogels

Photomodulation of the hydrophilic properties of acrylic polymers containing side-chain azobenzene chromophores

Phase Transition Behavior of Poly(N-isopropylacrylamide-co-N,Ndimethylaminopropylacrylamide) Hydrogels

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