Tests of mode coupling theory in a simple model for two-component miscible polymer blends
arXiv:0708.0799 · doi:10.1088/0953-8984/19/46/466112
Abstract
We present molecular dynamics simulations on the structural relaxation of a simple bead-spring model for polymer blends. The introduction of a different monomer size induces a large time scale separation for the dynamics of the two components. Simulation results for a large set of observables probing density correlations, Rouse modes, and orientations of bond and chain end-to-end vectors, are analyzed within the framework of the Mode Coupling Theory (MCT). An unusually large value of the exponent parameter is obtained. This feature suggests the possibility of an underlying higher-order MCT scenario for dynamic arrest.
Revised version. Additional figures and citations
References in corpus (6)
- Logarithmic Relaxation in Glass-Forming Systems
- Relaxation Scenarios in a Mixture of Large and Small Spheres: Dependence on the Size Disparity
- Anomalous Dynamic Arrest in a Mixture of Big and Small Particles
- Mode-coupling theory for the slow collective dynamics of fluids adsorbed in disordered porous media
- Mixing effects for the structural relaxation in binary hard-sphere liquids
- Logarithmic Relaxation in a Colloidal System