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We have studied the solubilization behaviour of tributylphosphate (TBP) inaqueous solutions of L64-Pluronics, using light and small angle neutronscattering (SANS). Varying the temperature and the oil-content, the systempresents a non trivial phase behaviour. In particular, at 308K, a firstsolubilization followed by an emulsification failure and a resolubilization isfound. We have measured the microstructure by SANS and characterized themicroemulsion droplet core-size, corona-thickness, polydispersity, andinteractions. It is shown that at low oil content, the system is made of smallswollen micelles. After the phase separation, the resolubilization is carriedby larger oil droplets decorated by copolymer. From specific surfacemeasurements at large angles, a surprising change in surfactant conformation isfound to accompany this morphological evolution which is also supported byprevious results obtained from 1H NMR experiments. In independent measurements,our structural modelling is confirmed using contrast-variation SANS.

Small-Angle Neutron Scattering study of solubilization of tributyl phosphate in aqueous solutions of L64 Pluronic triblock copolymers