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Solubilization of Phenols in Surfactant/polyelectrolyte Systems by A.F Olea; C Gamboa is a Chemistry article available to read on EtoBox.

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The properties of the microheterogeneous systems formed by mixtures of cetyltrimethylammonium bromide (CTAB) and an alternating copolymer of maleic acid and styrene, MAS, and their anionic monoesters, MAS-n with n = 2, 4, 6, 8, were investigated. The fluorescence of pyrene was used to sense the polarity of the polymer/CTAB aggregates. Measurements of the ratio III/I in pyrene fluorescence spectra indicate that the polymer/CTAB aggregates are more hydrophobic than normal micelles. A series of p-alkyl substituted phenols were employed to probe the solubilization ability of these aggregates. The distribution constant K S of phenol, p-methylphenol, p-ethylphenol, and p-propylphenol between water and MAS-n/CTAB aggregates and the corresponding free energy of transfer μ 0 t have been determined using the pseudo-phase model. The results show that the distribution is mainly determined by the phenol structure, and a linear free energy relationship has been found between μ 0 t and the structure of phenols. On the other hand, an increase in the number of methylene groups in the side alkyl chain has no effect on μ 0 t . The results are discussed and compared with those obtained for ionic micel

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Author

A.F Olea; C Gamboa

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2003

Language

EN

Field

Chemistry (Physical Sciences)