  A small amount of polymer dissolved in a droplet suppresses droplet rebound
when it impinges on a supersolvophobic surface. This work investigates
impacting dynamics of a droplet of dilute polymer solution depending on the
molecular weight and the concentration of the polymer by using multi-body
dissipative particle dynamics simulations. Either the longer polymer or the
high polymer concentration suppresses rebound of a droplet although its shear
viscosity and the liquid-vapor surface tension are not different from those of
a pure solvent droplet. We found a new mechanism of the anti-rebound in which
the resistance is applied against the hopping motion, while behavior of the
non-rebounding droplet at the earlier spreading and retraction stages is same
as for the rebounding droplets. Two polymer contributions to reducing the
rebound tendency are quantitatively analyzed: the alteration of the substrate
wettability by the polymer adsorption and the polymer elongation force.
