Complex coacervates have been studied for a long time for their medical applications and unusualphysical-chemical properties: they are dense networks of poly-electrolytes, that dissolve instead offlocculating when exposed to high salt concentrations. Despite being dense, they are fullypermeable to water, yet they are capable of strongly binding heavy metal ions or large (bio-)molecules, making them useful as drug carriers. By modifying them to form micelles, the micellecores become small coacervate networks; Complex Coacervate Core Micelles (C3Ms). Unlikegels, they are dispersed into solution easily and have an enormous active surface area. The formand structure of C3Ms are quite well known, but the exchange mechanism of polymers betweenmicelles is unknown. By performing contrast decay time-resolved SANS, we will determine ifpolymers migrate separately or not.