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What can we Learn from Molecular Dynamics Simulations of Macromolecular Liquids?

Published online by Cambridge University Press:  21 February 2011

Gary S. Grest ,
Kurt Kremer  and
Michael Murat
Gary S. Grest
Affiliation:
Corporate Research Science Laboratories, Exxon Research and Engineering Company, Annandale, NJ 08801
Kurt Kremer
Affiliation:
Institut für Festerkörperforschung der Kernforschungsanlage Jülich, D-5170 Jülich, Federal Republic of Germany
Michael Murat
Affiliation:
Corporate Research Science Laboratories, Exxon Research and Engineering Company, Annandale, NJ 08801
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Abstract

We describe how molecular dynamics simulations for a relatively simple coarse grained model can be very useful for investigating the static and dynamic properties of polymers and other macromolecular liquids. We show that it is important to use a simplified coarse grained model instead of a detailed microscopic model if one is interested in studying on modern supercomputers large systems which also relax slowly. As examples we present results for isolated star polymers with f-arms and diluted gelation/percolation clusters. We find in agreement with recent neutron scattering experiments that diluted percolation clusters swell and that their fractal dimension is reduced from 2.5 to 2. We also discuss our results for a dense melt of entangled linear polymers to show that the method is effective at high density. Our results for the entangled melt cover the crossover from Rouse to reptation and strongly support the concept of reptation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 177: Symposium V – Macromolecular Liquids , 1989 , 77
Copyright
Copyright © Materials Research Society 1990

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