Effect of Surfactants on the Volume Phase Transition of Cross-linked Poly(acryloyl-L-proline alkyl esters)

Safranj, Agneza; Yoshida, Minoru; Omichi, Hideki; Katakai, Ryoichi

doi:10.1021/la00021a018

Cited by 22 publications

(17 citation statements)

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“…The critical concentration C * required for the onset of surfactant-induced swelling agrees well with the critical concentration for the formation of polymer-bound micelles and is slightly lower than the CMC of SDS in water (8 × 10 -3 mol/L) . The analogous behavior was observed for poly-(acryloyl- l -proline alkyl ester) gels interacting with SDS . It was shown that the anionic surfactant begins to influence the swelling behavior of the gels only at the concentration ca.…”

Section: Resultssupporting

confidence: 60%

“…One of the most extensively studied systems involving lightly cross-linked networks are their complexes with ionic surfactants. The results of experimental and theoretical studies of these systems − suggest that the polymer gel/ionic surfactant interactions are primarily governed by three effects: translational entropy of counterions and electrostatic and hydrophobic polymer/surfactant interactions. While the first two effects are now usually taken into account in both experimental and theoretical studies, the literature dealing with hydrophobic interactions in polyelectrolyte gels remains very scarce, mainly because of the lack of experimental data on hydrogels of well-controlled hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

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Interaction of Hydrophobically Modified Poly(acrylic acid) Hydrogels with Ionic Surfactants

et al. 1996

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The role of the hydrophobic effect in polyelectrolyte gel/ionic surfactant interactions was investigated. A series of hydrophobically modified poly(acrylic acid) gels with well-controlled hydrophobicity was synthesized by free-radical copolymerization of acrylic acid with n-alkyl acrylates (n = 8, 12, and 18) in the presence of a cross-linking agent. The interaction of the gels with ionic surfactantsN-cetylpyridinium chloride and sodium dodecylbenzenesulfonatewas studied. Four gel/surfactant combinations were considered: uncharged gel/cationic surfactant, uncharged gel/anionic surfactant, anionic gel/cationic surfactant, and anionic gel/anionic surfactant. It was shown that the gels absorb cationic surfactant ions via an ion-exchange reaction with network counterions. On the other hand, the absorption of anionic surfactant is governed primarily by hydrophobic interactions, and hence, due to conditions of electroneutrality, anionic surfactant penetrates the gel together with corresponding co-ions. Therefore, the uptake of cationic surfactant ions results in gel shrinkage, while the uptake of anionic surfactant induces gel swelling. In the anionic gel/anionic surfactant system, a significant interaction is observed only for the most hydrophobic gels when hydrophobic interactions overcome the electrostatic repulsion between similarly charged groups.

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Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Interaction of Hydrophobically Modified Poly(acrylic acid) Hydrogels with Ionic Surfactants

et al. 1996

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“…The swelling nature of the hydrophobic polymer gels in the aqueous medium has been explained by the formation of an ice-like structure of water molecules around hydrophobic groups which is familiar in proteins. The formation of the ice-like structure around the hydrophobic groups makes it thermodynamically possible for the polymer chains to assume an extended conformation. , Thus the gels expand to form the swollen state. With increasing hydrophobicity of the polymer chains, however, the polymer−polymer interaction becomes predominant over the polymer−solvent interaction stabilized by the ice-like structures.…”

mentioning

confidence: 99%

Phase Transition of Hydrogels by “Pinpoint-Variation” of Polymer Side Chains

et al. 1996

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“…The association is best viewed as a micelle formation in the polymer at a cac that is lower than the critical micelle concentration (cmc) of the pure surfactant. The interaction of gels with charged surfactants was studied in the last several years 9–27. This process was shown to be governed mainly by electrostatic and hydrophobic forces.…”

Section: Introductionmentioning

confidence: 99%

Effect of crosslinking concentration on the micelle formation inside the polymer gel network and mechanical properties of sensitive hydrogel polymer in contact with surfactant solutions

Mounir

Darwish

Shehata

2004

J of Applied Polymer Sci

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ABSTRACT:The variation of the swelling and mechanical properties of crosslinked nonionic poly (N-isopropylacrylamide) (NIPA) polymer gel immersed in tetradecyl dimethylaminoxide (C14DMAO) surfactant solutions at 0.1M NaCl, synthesized at different crosslinker concentrations was investigated. Also the aggregation behavior of C14DMAO surfactants inside and outside the polymer hydrogels has been studied through solubilization of Sudan III dye. The solubilization experiments indicated that, at the degree of ionization ␣ ϭ 0.5 and 1, the surfactant concentration inside the gel is lower than that outside the gel at low crosslinker concentration. In the case of the nonionic C14DMAO at ␣ ϭ 0, on the other hand, the surfactant concentration inside the gel and outside the gel was almost identical, irrespective of the crosslinker concentration. The elastic modulus, G, of the network polymer gel in contact with the C14DMAO solutions of 5 and 10 mM concentration was larger than that of the water solution irrespective of the degree of ionization (␣ ϭ 0 and 0.5). This difference in the elastic modulus, G, of network polymer gel may be attributed to the change of the rigidity of the polymer network.

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Effect of Surfactants on the Volume Phase Transition of Cross-linked Poly(acryloyl-L-proline alkyl esters)

Cited by 22 publications

References 0 publications

Interaction of Hydrophobically Modified Poly(acrylic acid) Hydrogels with Ionic Surfactants

Interaction of Hydrophobically Modified Poly(acrylic acid) Hydrogels with Ionic Surfactants

Phase Transition of Hydrogels by “Pinpoint-Variation” of Polymer Side Chains

Effect of crosslinking concentration on the micelle formation inside the polymer gel network and mechanical properties of sensitive hydrogel polymer in contact with surfactant solutions

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