Dynamic structure factor of homogeneous diblock copolymers solutions

The dynamics of homogeneous diblock copolymer solutions in the mean field regime sensitively depends on the composition polydispersity at constant chain length polydispersity. It was observed by photon correlation spectroscopy that the decay of the order parameter fluctuations in high molecular mass diblock copolymers solutions in a common solvent can change from a pure relaxational to a pure diffusive character. A rationalization of this behavior is presented.