  Surface segregation of the low-molecular weight component in a polymeric
mixture leads to degradation of industrial formulations. We report a
simultaneous phase separation and surface migration phenomena in
oligomer-polymer and oligomer-gel systems following a temperature quench. We
compute equilibrium and time varying migrant density profiles and wetting layer
thickness using coarse grained molecular dynamics and mesoscale hydrodynamics
simulations to demonstrate that surface migration in oligomer-gel systems is
significantly reduced due to network elasticity. Further, phase separation
processes are significantly slowed in gels, modifying the
Lifshitz-Slyozov-Wagner (LSW) law $\ell(\tau) \sim \tau^{1/3}$. Our work allows
for rational design of polymer/gel-oligomer mixtures with predictable surface
segregation characteristics.
