Power Law Behavior of Dynamics in Simple Glass Formers
ORAL
Abstract
Simulation results for the diffusive behavior of polymer chain/ penetrant systems are analyzed. Both freely jointed and freely rotating chains are studied. In all cases, the characteristic times, $\tau $, extracted from the diffusion constants are found to be single valued functions of the packing fraction, $\eta $. The functions $\tau (\eta )$ are found to be power-laws with exponents that are sensitive to both chain stiffness and particle type. For a specific system type, all measures of motion extrapolate to zero (or infinity) at a single $\eta _{0}$. In addition, ($\eta _{0}-\eta )$ can be interpreted as a ``scalar metric'' of the ``distance'' to the glass ``transition.''
*Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.
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