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

olea a.f.; Carrasco H.; Espinoza L.; Acevedo B.

Abstract

The 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.

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Título según WOS: SOLUBILIZATION OF P-ALKYLPHENOLS IN PLURONICS F-68 AND F-127 MICELLES: PARTITION COEFFICIENTS AND EFFECT OF SOLUTE ON THE AGGREGATE STRUCTURE
Título según SCOPUS: Solubilization of p-alkylphenols in Pluronics F-68 and F-127 micelles: Partition coefficients and effect of solute on the aggregate structure
Título según SCIELO: SOLUBILIZATION OF P-ALKYLPHENOLS IN PLURONICS F-68 AND F-127 MICELLES: PARTITION COEFFICIENTS AND EFFECT OF SOLUTE ON THE AGGREGATE STRUCTURE
Título de la Revista: Journal of the Chilean Chemical Society
Volumen: 59
Número: 2
Editorial: SOC CHILENA QUIMICA
Fecha de publicación: 2014
Página de inicio: 2451
Página final: 2454
Idioma: English
DOI:

10.4067/S0717-97072014000200011

Notas: ISI, SCIELO, SCOPUS - ISI