Diffusivities and Viscosities of Poly(ethylene oxide) Oligomers †

Type
Article

Authors
Hong, Bingbing
Escobedo, Fernando
Panagiotopoulos, Athanassios Z.

KAUST Grant Number
KUS-C1-018-02

Date
2010-10-14

Abstract
Diffusivities and viscosities of poly(ethylene oxide) (PEO) oligomer melts with 1 to 12 repeat units have been obtained from equilibrium molecular dynamics simulations using the TraPPE-UA force field. The simulations generated diffusion coefficients with high accuracy for all of the molar masses studied, but the statistical uncertainties in the viscosity calculations were significantly larger for longer chains. There is good agreement of the calculated viscosities and densities with available experimental data, and thus, the simulations can be used to bridge gaps in the data and for extrapolations with respect to chain length, temperature, and pressure. We explored the convergence characteristics of the Green-Kubo formulas for different chain lengths and propose minimal production times required for convergence of the transport properties. The chain-length dependence of the transport properties suggests that neither Rouse nor reptation models are applicable in the short-chain regime investigated. © 2010 American Chemical Society.

Citation
Hong B, Escobedo F, Panagiotopoulos AZ (2010) Diffusivities and Viscosities of Poly(ethylene oxide) Oligomers † . J Chem Eng Data 55: 4273–4280. Available: http://dx.doi.org/10.1021/je100430q.

Acknowledgements
Received for review April 27, 2010. Accepted June 5, 2010. This publication is based on work supported by Award KUS-C1-018-02 made by King Abdullah University of Science and Technology (KAUST).

Publisher
American Chemical Society (ACS)

Journal
Journal of Chemical & Engineering Data

DOI
10.1021/je100430q

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