Polymer-specific effects of bulk relaxation and stringlike correlated motion in the dynamics of supercooled polymer melt

Polymer-specific effects of bulk relaxation and stringlike correlated motion in the dynamics of a supercooled polymer melt

We analyze dynamical heterogeneities in a simulated ‘‘bead-spring’’ model of a nonentangled, supercooled polymer melt. We explore the importance of chain connectivity on the spatially heterogeneous motion of the monomers. We find that when monomers move, they tend to follow each other in one-dimensional paths, forming strings as previously reported in atomic liquids and colloidal suspensions. T...

Stringlike correlated motion in the dynamics of supercooled polymer melts

Dynamics of Glassy Polymer Melts in Confined Geometry: A Monte Carlo Simulation

Dynamic properties of a dense polymer melt confined between two hard watts are investigated over a wide range of temperatures by dynamic Monte Carlo simulation. The temperature interval ranges from the ordinary Iiquid to the strongly supercooled melt. The influence of temperature, density aud confinement on the polymer dynamics is studied by vanous mean-square displacements, structural relaxati...

Recent MD Results on Supercooled Thin Polymer Films

The dynamic and static properties of a supercooled (non-entangled) polymer melt are investigated via molecular dynamics (MD) simulations. The system is confined between two completely smooth and purely repulsive walls. The wall-to-wall separation (film thickness), D, is varied from about 3 to about 14 times the bulk radius of gyration. Despite the geometric confinement, the supercooled films ex...

Dynamics of Highly Supercooled Liquids far

We rst review our recent simulation work on dynamic heterogeneity and supercooled liquid rheology. We then treat a supercooled polymer melt to study the stress relaxation function, transient stress evolution, shear-thinning, and elongation of chains.