Organization of surfactant micelles adsorbed on a polymer molecule in water : a neutron scattering study
نویسندگان
چکیده
2014 Complex particles are formed in water by the spontaneous association of poly(ethylene oxide) macromolecules (PEO) with the small amphiphilic molecules of sodium dodecylsulfate (SDS). As a result, the phase diagram of dilute PEO + SDS solutions shows 2 singularities : a critical SDS concentration for the formation of the aggregates, and a stoichiometry. Small angle neutron scattering experiments on the stoichiometric aggregates are reported; the contrast variation method is used to determine separately the configuration of the polymer and that of the amphiphile in a PEO + SDS aggregate. The following structure is obtained : (i) each aggregate contains a single PEO macromolecule whose radius of gyration is comparable to that of a « free » PEO coil; (ii) the SDS molecules of the aggregate are clustered in subunits which are small spheres, 20 A in radius, similar to the micelles formed by pure SDS solutions at low ionic strengths; (iii) these subunits are adsorbed on the PEO strands; a distance between neighbouring subunits within the aggregate has been measured. Moreover, the contrast variation experiment shows that all the aggregates present in stoichiometric PEO + SDS solutions share the same composition. J. Physique 43 (1982) 1529-1542 OCTOBRE 1982,
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