Viscoelastic behaviors in polymeric nanodroplet collisions.

Viscoelastic behaviors in the head-on collisions of polymeric nanodroplets are reported. We propose a new model for normal forces between two colliding droplets. By decomposing the force into an elastic component and a dissipative component and carefully analyzing the equation of motion, we obtain some conditions on the model parameters imposed by the thermodynamic arguments. By employing molecular dynamics simulations, we can explicitly determine the corresponding model parameters by fitting. We compare the model predictions with the simulation results. ©2011 American Physical Society