DIFFUSIVE RELAXATION MODE IN DIBLOCK COPOLYMER MELTS

Photon correlation spectroscopy in the polarized light scattering geom etry can be employed to study the dynamics of composition fluctuations in disordered diblock copolymer melts near the order-to-disorder tran sition. The origin of a diffusive relaxation mode, very recently measu red on a series of undiluted copolymers, can be rationalized in terms of composition polydispersity effects rather than relaxation of equili brium composition configurations of the fluctuation theory.