  We carry out numerical simulations of vesicle formation based on the density
functional theory for block copolymer solutions. It is shown by solving the
time evolution equations for concentrations that a polymer vesicle is
spontaneously formed from the homogeneous state. The vesicle formation
mechanism obtained by our simulation agree with the results of other
simulations based on the particle models as well as experiments. By changing
parameters such as the volume fraction of polymers or the Flory-Huggins
interaction parameter between the hydrophobic subchains and solvents, we can
obtain the spherical micelles, cylindrical micelles or bilayer structures, too.
We also show that the morphological transition dynamics of the micellar
structures can be reproduced by controlling the Flory-Huggins interaction
parameter.
