The changes in the structure and interaction of micelles of anionic surfactant, dodecylbenzene
sulphonic acid (DBSA), in aqueous solutions upon addition of neutral polymer poly
(ethylene glycol) (PEG) were analyzed using the data of small-angle neutron scattering
(SANS) and surface tension measurements. The surface tension data showed the formation
of surfactant-polymer complexes, which resulted in a shift of critical micelle concentration
as compared to non-modified surfactant solutions and also in the appearance of a critical
aggregation concentration. The variations in the dependences of the structure and
interaction parameters of micelles (aggregation number, fractional charge, charge
per micelle, surface potential, etc.) derived from the SANS data analysis were interpreted
as an influence of micelle binding on polymer chains and surfactant-polymer association.
The obtained results are compared with the previous data on aqueous solutions of another
anionic surfactant, sodium oleate. (C) 2018 Elsevier B.V. All rights reserved.