SOLUBILIZATION OF P-ALKYLPHENOLS IN PLURONICS F-68 AND F-127 MICELLES: PARTITION COEFFICIENTS AND EFFECT OF SOLUTE ON THE AGGREGATE STRUCTURE

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dc.contributor.authorOLEA, ANDRÉS F.
dc.contributor.authorCARRASCO, HÉCTOR
dc.contributor.authorESPINOZA, LUIS
dc.contributor.authorACEVEDO, BETSABE
dc.date.accessioned2016-07-04T15:29:23Z
dc.date.available2016-07-04T15:29:23Z
dc.date.issued2014-07
dc.descriptionIndexación: Web of Science; Scielo.es
dc.description.abstractThe partition of a series of substituted phenols between water and polymer micelles formed by Pluronic F-68 and F-127 has been studied. The formation of micelles by these block copolymers has been evidenced by steady-state fluorescence and dynamic light scattering. The data show that micelles and larger aggregates are formed above the critical micelle concentration. In presence of p-alkylphenols a micelle rearrangement occurs that leads to the formation of just one and large aggregate. This effect depends both on polymer and phenols structures. The partition coefficients and the standard free energies of transfer from the aqueous to the micellar phases were determined. The incremental free energy for a methylene group are 2.88 kJ mol-1 and 1.65 kJ mol-1 for F-127 and F-68, respectively. This difference is explained in terms of the core sizes that are determined by the length of the PPO block.es
dc.description.urihttp://ref.scielo.org/xfqmx3
dc.identifier.citationJ. Chil. Chem. Soc. vol.59 no.2 Concepción July 2014es
dc.identifier.issn0717-9707
dc.identifier.otherhttp://dx.doi.org/10.4067/S0717-97072014000200011
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/942
dc.language.isoenes
dc.publisherSociedad Chilena de Químicaes
dc.subjectPluronices
dc.subjectBlock copolymerses
dc.subjectPolymer micelleses
dc.subjectPartitiones
dc.subjectFree energy of transferes
dc.subjectCritical micelle concentrationes
dc.subjectFluorescence probing methodses
dc.subjectDynamic light scatteringes
dc.titleSOLUBILIZATION OF P-ALKYLPHENOLS IN PLURONICS F-68 AND F-127 MICELLES: PARTITION COEFFICIENTS AND EFFECT OF SOLUTE ON THE AGGREGATE STRUCTUREes
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