  The spreading of one- and two-component polymer nanodroplets is studied using
molecular dynamics simulation in a cylindrical geometry. The droplets consist
of polymer chains of length 10, 40, and 100 monomers per chain described by the
bead-spring model spreading on a flat surface with a surface-coupled Langevin
thermostat. Each droplet contains ~350,000 monomers. The dynamics of the
individual components of each droplet are analyzed and compared to the dynamics
of single component droplets for the spreading rates of the precursor foot and
bulk croplet, the time evolution of the contact angle, and the velocity
distribution inside the droplet. We derive spreading models for the cylindrical
geometry analogous to the kinetic and hydrodynamic models previously developed
for the spherical geometry and show that hydrodynamic behavior is observed at
earlier times for the cylindrical geometry. The contact radius is predicted to
scale like r(t) t^1/5 from the kinetic model and r(t) t^1/7 for the
hydrodynamic model in the cylindrical geometry.
