Binding constants and partial molar volumes of primary alcohols in sodium dodecylsulfate micelles

DeLisi, R.; Lizzio, A.A.; Milioto, Stefana; Liveri, Vincenzo Turco

doi:10.1007/bf00644596

Cited by 44 publications

(15 citation statements)

References 40 publications

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“…The most predominant among them is probably the use of the pseudo-phase model, which is an acceptable approximation for free energy calculations but is understandably less adequate for the representation of more sensitive derivative functions; furthermore, the neglected contribution of all interactions below the cmc may also play a role, as shown by de Lisi et al [14] in the case of partial molar volumes.…”

Section: Micellar Solutionsmentioning

confidence: 97%

Enthalpy of solution of phenoxyalcohols solubilized in aqueous sodium dodecylsulfate and hexadecyltrimethylammonium bromide solutions

Treiner

1987

Colloid & Polymer Sci

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Abstract:The enthalpy of solution of phenoxy 2-ethanol, 1 phenoxy,-3 propanol and benzylalcoholwas determined at 25 ~ in aqueous sodium dodecylsulfate and hexadecyltrimethylammonium bromide solution, up to 0.2 mol/kg surfactant concentration. Using the pseudo-phase model, the standard enthalpy of transfer and the partition coefficiem of the alcohols between micelle and water are calculated. The latter quantity is found to be systematically larger when derived from enthalpy than from free energy measurements. Using the so-called compensation plot, the solution thermodynamics of aromatic and aliphatic alcohols in aqueous sodium dodecylsulfate and in the octane + water systems are compared. Aromatic alcohols display an anomalous behavior in the octane + water system but not in the micellar one. The standard enthalpy of solution of various alcohols presents, when plotted against hexadecyltrimethylammonium bromide concentration, a shoulder in the region around 0.05 mol/kg; a discussion is presented on the evidence for alleged micellar structural changes in aqueous micellar systems.

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Section: Micellar Solutionsmentioning

confidence: 97%

Enthalpy of solution of phenoxyalcohols solubilized in aqueous sodium dodecylsulfate and hexadecyltrimethylammonium bromide solutions

Treiner

1987

Colloid & Polymer Sci

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“…Moreover, the relation between the alcohol aggregation and surfactant micellization was not indicated. Only de Lisi et al [14,15] stated that the addition of the middle-chain alcohols (including propanol) in their low concentration range causes the initial CMC decrease of dodecyltrimethylammonium bromide and with the increasing alcohol concentration, micelles gradually lose their identity. Over the so-called critical microstructure concentration, alcohol molecules aggregate in the bulk phase of the solution and they are probably surrounded by surfactant molecules only in the monomeric form.…”

Section: Introductionmentioning

confidence: 98%

“…The literature data concern mainly the influence of alcohol on the surfactant micellization process [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, despite numerous papers describing surfactant behavior in the water + alcohol mixed solvent, this issue has not been sufficiently explained yet.…”

Section: Introductionmentioning

confidence: 99%

Behavior of hexadecyltrimethylammonium bromide and Triton X-100 mixture in the bulk phase of aqueous solution in the presence of methanol and propanol

Bielawska

Jańczuk

Zdziennicka

2015

Journal of Molecular Liquids

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“…25 The variation in partial volume of solutes in the micellar phase is ascribed to the hydrophilic or hydrophobic interaction between some groups of solute and emulsifier. 26 The reverse behavior (the appearance of the limiting conversion) was observed in the (micro)emulsion polymerization containing a very small amount of butyl acrylate where the limiting conversion results from the hydrophilic interaction between the polar groups of emulsifier (sodium dodecyl sulfate, SDS) and butyl acrylate. 27 At a very low monomer concentration, the monomer can be consumed by both the solute and propagating radicals.…”

Section: Polymerization Ratementioning

confidence: 99%

Sterically Stabilized Emulsion Polymerization of Styrene

Capek

2004

Polym J

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ABSTRACT:Batch emulsion polymerizations of styrene initiated by ammonium peroxodisulfate (APS) and 2,2 0 -azobisizobutyronitrile (AIBN) at a broad monomer concentration range were investigated. The role of the thick emulsifier layer formed by a nonionic emulsifier was investigated in the sterically stabilized emulsion polymerization of styrene. The polymerization rate vs. conversion dependence was characterized by two or three nonstationary rate intervals. The rate of polymerization increases with the monomer concentration and the increase is much more pronounced at lower monomer concentrations. The deviation from the micellar model was ascribed to the high oil-solubility of nonionic emulsifier and the chain transfer and desorption events. The values of desorption rate constant k 0 des for the sterically stabilized emulsion polymerization of styrene are slightly than those for the electrostatically stabilized emulsion polymerization of styrene. The number of polymer particles is nearly independent of the monomer concentration at ca. 20-30 % conversion. The dependence of the final polymer particle number vs. the monomer concentration is described by a curve with a maximum. The primary radical termination decreases the rate of polymerization, the number of polymer particles and the final conversion at the high concentration of both APS and AIBN. In the former APS system the less hydrophobic oligomeric radicals with depressed entry rate into particles appear. In the latter AIBN system the growing radicals are deactivated by primary radicals derived from AIBN. The similar polymerization behavior for both initiators results from the dominant chain transfer and radical exit events. The molecular weight of polystyrene is inversely proportional to the initiator concentration.

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Binding constants and partial molar volumes of primary alcohols in sodium dodecylsulfate micelles

Cited by 44 publications

References 40 publications

Enthalpy of solution of phenoxyalcohols solubilized in aqueous sodium dodecylsulfate and hexadecyltrimethylammonium bromide solutions

Enthalpy of solution of phenoxyalcohols solubilized in aqueous sodium dodecylsulfate and hexadecyltrimethylammonium bromide solutions

Behavior of hexadecyltrimethylammonium bromide and Triton X-100 mixture in the bulk phase of aqueous solution in the presence of methanol and propanol

Sterically Stabilized Emulsion Polymerization of Styrene

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