Phase Behavior of Polymers with Concentrated Dispersions of Surfactants

Clegg, Stuart; Williams, Peter; Warren, Patrick B.; Robb, Ian D.

doi:10.1021/la00022a006

Cited by 42 publications

(51 citation statements)

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“…34 This and other studies on polymer/surfactant systems have shown that the segregative two-phase area increases with increasing polymer MW 35,36 or with increasing size of the surfactant micelle. [34][35][36][37][38] A strong partitioning of the solvent to the polymer-rich phase in a segregating mixture of spherical particles and polymer in a common solvent is expected and is in fact typically observed in aqueous polymer/surfactant and polymer/protein mixtures. 34,39 This effect can be traced to the fact that the osmotic pressure of a flexible polymer solution is larger than that of a solution of compact particles, if the solutes have the same molar mass and the solutions are compared at the same mass concentration of solutes.…”

Section: Discussionmentioning

confidence: 83%

Investigation of the Segregative Phase Separation Induced by Addition of Polystyrene to AOT Oil-Continuous Microemulsions

2004

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The effect of different molecular weight polystyrenes (PS) on the phase behavior of sodium 1,4-bis(2-ethylhexyl) sulfosuccinate (AOT)/water/cyclohexane oil-continuous microemulsions was investigated. The surfactantcovered water droplets were treated as a pseudocomponent in the mixture, and ternary polymer/droplet/oil phase diagrams were established as a function of microemulsion droplet radius (2.7 or 3.8 nm), PS molecular weight (18 700, 45 730, and 700 000), and temperature. The different polymer radii of gyration (R g ) and droplet radii (R d ) resulted in a broad range of size ratios (R g /R d ) q) being accessible: 0.9 e q e 8.9. The aims of this work were to study polymer-particle segregation in this well-defined system, where both polymer size, particle size, and hence size ratio could be controlled and where polymer-solvent interactions could be varied across the θ temperature, and to compare the fluid-fluid binodal phase diagrams with those predicted theoretically. It turns out that the polystyrene chains in AOT oil-continuous microemulsions behave almost as ideal chains, over all q values and temperatures investigated.

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Section: Discussionmentioning

confidence: 83%

Investigation of the Segregative Phase Separation Induced by Addition of Polystyrene to AOT Oil-Continuous Microemulsions

2004

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“…However, the extent of depression of CP is 4-5°C in case of HEC, while HMHEC lowers the CP to about 20°C for TX-114 and 50°C for TX-100 at low concentration of both the surfactants. This may be due to the absence of strong molecular interaction exerted by HEC with surfactant except for the excluded volume effect [153,154], thereby leading to a depletion flocculation for the micelles and a segregative phase separation [155]. Conversely, added HMHEC provides sufficient hydrophobic interaction with surfactant molecules resulting in the formation of mixed micelles [156][157][158][159][160].…”

Section: Effect Of Organic Additivesmentioning

confidence: 99%

Clouding behaviour in surfactant systems

Mukherjee

Padhan

Dash

et al. 2011

Advances in Colloid and Interface Science

166

109

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“…39 Our analytic PRISM theory is applicable to all size ratios of the particle to the polymer R g , and can probe situations of arbitrarily high size asymmetry which are difficult or impossible to study presently via either numerical PRISM theory or simulations. Cases in which the particle radius R exceeds the coil size R g are relevant to the interactions of polymers with colloidal particles, for which typically 1-16 RϷ50-500 nm; on the other hand, the interaction of polymers with globular protein molecules 17 or spherical surfactant micelles 48 for which RϷ10Ϫ20 Å often corresponds to RӶR g . We refer to calculations in the regimes RӷR g and RӶR g as ''colloidlike'' and ''proteinlike'' cases, respectively.…”

Section: Introductionmentioning

confidence: 99%

Microscopic theory of polymer-mediated interactions between spherical particles

Chatterjee¹,

Schweizer²

1998

The Journal of Chemical Physics

128

112

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We develop an analytic integral equation theory for treating polymer-induced effects on the structure and thermodynamics of dilute suspensions of hard spheres. Results are presented for the potential of mean force, free energy of insertion per particle into a polymer solution, and the second virial coefficient between spheres. The theory makes predictions for all size ratios between the spheres and the polymer coil dimension. Based on the Percus-Yevick ͑PY͒ closure, the attractive polymer-induced depletion interaction is predicted to be too weak under athermal conditions to induce a negative value for the second virial coefficient, B 2 cc , between spheres in the colloidal limit when the spheres are much larger than the coil size. A nonmonotonic dependence of the second virial coefficient on polymer concentration occurs for small enough particles, with the largest polymer-mediated attractions and most negative B 2 cc occurring near the dilute-semidilute crossover concentration. Predictions for the polymer-mediated force between spheres are compared to the results of computer simulations and scaling theory.

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Phase Behavior of Polymers with Concentrated Dispersions of Surfactants

Cited by 42 publications

References 0 publications

Investigation of the Segregative Phase Separation Induced by Addition of Polystyrene to AOT Oil-Continuous Microemulsions

Investigation of the Segregative Phase Separation Induced by Addition of Polystyrene to AOT Oil-Continuous Microemulsions

Clouding behaviour in surfactant systems

Microscopic theory of polymer-mediated interactions between spherical particles

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