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

Journal of The Chilean Chemical Society

BETSABE, ACEVEDO¹  ANDRÉS F., OLEA²  HÉCTOR, CARRASCO²  LUIS, ESPINOZA³ 

[1] Universidad Andrés Bello, Viña del Mar, Chile;Universidad Autónoma de Chile, Santiago, Chile;Universidad Técnica Federico Santa María, Valparaíso, Chile

关键词: Pluronic;    blockcopolymers;    polymer micelles;    partition;    free energy of transfer;    critical micelleconcentration;    fluorescence probing methods;    dynamic light scattering.;   

DOI  :  10.4067/S0717-97072014000200011

学科分类：化学（综合）

来源: Sociedad Chilena de Quimica

【 摘 要 】

The partition of a series ofsubstituted phenols between water and polymer micelles formed by Pluronic F-68and F-127 has been studied. The formation of micelles by these block copolymershas been evidenced by steady-state fluorescence and dynamic light scattering.The data show that micelles and larger aggregates are formed above the criticalmicelle concentration. In presence of p-alkylphenols a micelle rearrangementoccurs that leads to the formation of just one and large aggregate. This effectdepends both on polymer and phenols structures. The partition coefficients andthe standard free energies of transfer from the aqueous to the micellar phaseswere determined. The incremental free energy for a methylene group are 2.88kJ 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 aredetermined by the length of the PPO block.

【 授权许可】

Unknown