  The properties of the interface in a phase-separated solution of polymers
with different degrees of polymerization and Kuhn segment lengths are
calculated. The starting point is the planar interface, the profile of which is
calculated in the so-called 'blob model', which incorporates the solvent in an
implicit way. The next step is the study of a metastable droplet phase formed
by imposing a chemical potential different from that at coexistence. The
pressure difference across the curved interface, which corresponds to this
higher chemical potential, is used to calculate the curvature properties of the
droplet. Interfacial tensions, Tolman lengths and rigidities are calculated and
used for predictions for a realistic experimental case. The results suggest
that interfaces between phase-separated solutions of polymers exhibit, in
general, a preferential curvature, which stabilizes droplets of low molecular
mass polymer in a high molecular mass macroscopic phase.
