Theory of secondary domain structures in disordered multiblock copolymers

Microdomain structures in multicblock copolymers are studied theoretically with the focus on the effect of block polydispersity. It is shown that even weak polydispersity results in formation of secondary domains characterize d by an internal primary microstructure. These secondary structures are pre dicted near the transition lines between different primary morphologies. Th e secondary domain size is very sensitive to temperature, polydispersity de gree, etc. The secondary morphologies resulting from competition between di sordered and spherical (cylindrical and lamellar) primary structures are st udied in detail.