Title: Evaluation of different methods for the determination of the plateau modulus and the entanglement molecular weight
Authors: Liu, Chenyang ×
He, Jiasontg
van Ruymbeke, Evelyne
Keunings, Roland
Bailly, Christian #
Issue Date: Jun-2006
Publisher: Elsevier sci ltd
Series Title: Polymer vol:47 issue:13 pages:4461-4479
Abstract: We critically evaluate and compare all major published methods for the experimental determination of the plateau modulus for monodisperse as well as polydisperse polymers with linear architecture. For long-chain monodisperse model systems (M-W/M-n < 1.1 and number of entanglements > 20-30), the various methods show excellent agreement. within an error margin of 5-10% close to the experimental uncertainty. For low numbers of entanglements, the terminal peak integration method requires a careful extrapolation at the high frequency side. This is best achieved by a simple subtraction of the Rouse relaxation. The universal terminal relaxation concept is validated for long chains. in logical agreement with tube model concepts. We further analyze the extension to polvdisperse polymers of the methods validated for monodisperse systems. Agreement between the methods within a 15% range can be achieved in favorable cases. The preferred method is the terminal peak integration, with the same caveats as for monodisperse samples. Predictions from tube models can nicely complement other approaches but should be used with caution because they are sensitive to errors on the experimentally determined molecular weight and distribution. Methods based on the 'crossover' modulus are only semi-quantitative. A cross-check of all available methods is the best way to achieve maximal accuracy for polydisperse systems. (c) 2006 Elsevier Ltd. All rights reserved.
ISSN: 0032-3861
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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