Perturbation of SDS and CTAB Micelles by Complexation with Poly(ethylene oxide) and Poly(propylene oxide)

Article abstract of DOI:10.1021/jo00230a021

Pseudo-first-order rate constants have been determined for the neutral hydrolysis of 1-benzoyl-3-phenyl-1,2,4-triazole in aqueous solutions in the presence of SDS and CTAB micelles and SDS-PEO, SDS-PPO, and CTAB-PPO mixed micelles.The micellar rate inhibition of the hydrolysis is clearly modified as a result of micelle-polymer complexation, the effects being rather specific for the nature of the surfactant and the polymer.The kinetic data were analyzed by a simple pseudophase model.The results revealed stabilization of the micelles by interaction with the polymer and polymer-induced microenvironmental changes at the micellar binding sites of the substrate.Results from conductivity measurements facilitated the interpretation of the kinetic data.