  We examine the existence and stability of frozen waves in diblock copolymers
with local conservation of the order parameter, which are described by the
modified Cahn--Hilliard model. It is shown that a range of stable waves exists
and each can emerge from a `general' initial condition (not only the one with
the lowest density of free energy). We discuss the implications of these
results for the use of block copolymers in templating nanostructures.
