The phase behavior of mixtures of two monodisperse diblock copolymers
made up of A and B monomer units is investigated using self-consistent
mean-field theory. A new scheme for phase structure analysis, namely,
a ''phase cube'', is introduced and used to study the global symmetri
es with respect to the chemical compositions and the volumes fractions
of the two components. Within the global scheme local density profile
s for selected structures and molecular parameters are calculated and
used to study the self-organization of the polymer chains. Several par
ticularly interesting structures, such as the bilayer and inverted sph
erical phases, are investigated. Some possible uses for the inverted s
pherical phase in local thermodynamic equilibrium with polymeric compo
nents different from the A and B blocks of the copolymers are suggeste
d.