Interactions between hydrophobically modified polyelectrolyte and oppositely charged surfactant. Mixed micelle formation

Guillemet, Francois; Djabourov, Madeleine; Piculel, L.; Nilsson, Svante; Lindman, Björn

doi:10.1007/bfb0115206

Cited by 19 publications

(13 citation statements)

References 8 publications

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“…The interactions between ionic polymers and surfactants of opposite charge have been well characterized over the past few decades. − The mixing of an aqueous solution of an ionic polymer with an oppositely charged surfactant generally results in an associative phase separation. This phenomenon is well documented, and in this process a concentrated phase is formed that is enriched in both the charged polymer and the surfactant.…”

Section: Introductionmentioning

confidence: 99%

Light Scattering and Viscoelasticity in Aqueous Mixtures of Oppositely Charged and Hydrophobically Modified Polyelectrolytes

et al. 1999

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Rheological and intensity (ILS) and dynamic light scattering (DLS) experiments were performed on semidilute aqueous mixtures of various compositions of oppositely charged and hydrophobically modified polyelectrolytes. The associative phase separation usually observed when mixing oppositely charged polyelectrolytes is restricted to a fairly narrow mixing region when the polymers are hydrophobically modified. Measurements were carried out at mixing ratios both before and after this two-phase area. The rheological properties in the vicinity of the two-phase region show that the elastic response dominates even at fairly low frequencies, indicating the existence of strong intermolecular interactions. The time correlation data obtained from the DLS experiments revealed the existence of two relaxation modes, one single exponential at short times followed by a stretched exponential at longer times. The fast mode is always diffusive, and the extracted hydrodynamic correlation length as well as the static one from ILS increases toward phase separation of the mixture. The slow relaxation time reveals that the dynamics slowed down in the vicinity of phase separation, and the angular dependence of the slow mode is stronger than that of the fast mode and increases gradually as the two-phase region is approached. These features that are attributed to enhanced hydrophobic associations can be rationalized in the framework of the coupling model of Ngai. The fractal dimension, determined from ILS, drops toward phase separation, and this trend suggests a more “open” network structure at this stage.

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Section: Introductionmentioning

confidence: 99%

Light Scattering and Viscoelasticity in Aqueous Mixtures of Oppositely Charged and Hydrophobically Modified Polyelectrolytes

et al. 1999

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“…Several other classes of polymers interact strongly with surfactants. In particular, surfactants bind to hydrophobically modified polymers, such as water-soluble polymers with hydrophobic end caps or polymers with hydrophobic side chains. ,− Ionic surfactants bind strongly to polyelectrolytes of opposite charge. − Weakly-charged polyampholytes like proteins are well-known to complex with anionic surfactants; the interaction has both charge and hydrophobic contributions and is sufficiently strong to destroy the tertiary structure of the protein. This phenomenon is the basis for the molecular weight determination of polypeptides by means of sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis.…”

Section: Introductionmentioning

confidence: 99%

Interaction between Gelatin and Anionic Surfactants

et al. 1996

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The effects of alkyl chain length of homologous alkyl sulfate surfactants ranging from C8 to C14 on the diffusion behavior of both the surfactant and gelatin have been investigated by pulsed-gradient spin-echo NMR spectroscopy. Changes in the diffusivity of the surfactant can be rationalized in terms of a two-state model consisting of gelatin-bound micelles in equilibrium with freely diffusing unimeric surfactant. A minimum in the diffusivity of gelatin is observed when the binding of surfactant amounts to about 1 micelle/strand. The depth of this minimum increases with the chain length of the surfactant. These effects are explained in terms of micelle-mediated transient cross-links as proposed by Greener et al. (Macromolecules 1987, 20, 2490). The effective strength of the cross-links is a decreasing function of the number of micelles/strand because of the electrostatic repulsion between the micelles; the strength increases with an increase in the size of the micelles.

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“…The interaction between certain polymer and surfactant pairs in aqueous solution has been studied extensively 1,2 because of the useful properties that the polymer (rheological control, stability enhancement) and surfactant (surface tension lowering, wetting) impart to the system. Generally, interactions between nonionic polymers and anionic surfactants, 3,4 polyelectrolytes and oppositely charged surfactants, 5, 6 or hydrophobically modified polymers and anionic surfactants 6,7 are significant. Any interaction between non-ionic polymers and non-ionic surfactants is considerably weaker and largely due to excluded volume effects.…”

Section: Introductionmentioning

confidence: 99%

EPR insights into aqueous solutions of gelatin and sodium dodecyl sulfate †

Griffiths¹,

Rowlands²,

Goyffon³

et al. 1997

J. Chem. Soc., Perkin Trans. 2

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The characteristics of the EPR spectra of the spin-probe 16-doxyl-stearic acid ‡ methyl ester (16-DSE) solubilised in micelles of the anionic surfactant sodium dodecyl sulfate (SDS) have been examined as functions of SDS and gelatin concentrations. For simple SDS solutions, the rotational correlation time increases slightly with surfactant concentration whilst the polarity decreases slightly. In contrast, however, in the presence of gelatin these properties vary markedly as a function of the stoichiometric ratio of the concentration of surfactant to gelatin; the correlation time decreasing and the hyperfine coupling constant increasing with increasing surfactant concentration. In the presence of gelatin therefore, 16-DSE reports a very different micellar environment compared with the simple SDS case. Furthermore, this environment differs significantly from that observed in solutions of synthetic, non-ionic homopolymers and SDS. These features arise due to the varied characteristics of the amino acids present in the protein.

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Interactions between hydrophobically modified polyelectrolyte and oppositely charged surfactant. Mixed micelle formation

Cited by 19 publications

References 8 publications

Light Scattering and Viscoelasticity in Aqueous Mixtures of Oppositely Charged and Hydrophobically Modified Polyelectrolytes

Light Scattering and Viscoelasticity in Aqueous Mixtures of Oppositely Charged and Hydrophobically Modified Polyelectrolytes

Interaction between Gelatin and Anionic Surfactants

EPR insights into aqueous solutions of gelatin and sodium dodecyl sulfate †

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