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Dilute Polyacrylamide Solutions under Uniaxial Extensional Flow

Pelletier, E, Viebke, C, Meadows, J and Williams, Peter A (2003) Dilute Polyacrylamide Solutions under Uniaxial Extensional Flow.

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Abstract

The shear and extensional viscosities, dynamic viscosities, and normal forces of a series of polyacrylamide solutions of varying molar mass have been determined in a Boger fluid at varying concentrations. The critical strain rate under extensional flow that can be defined from the departure from Newtonian behavior, εc, was found to be independent of the concentration and varied in the same way as the critical coil−stretch strain rate with the molar mass. A quantitative comparison indicated that εc is a decade lower than the strain rate predicted to characterize the coil−stretch transition. This difference indicates that εc reflects the average deformation of the chains over the range of strain rates.

Item Type: Article
Additional Information: Copyright © 2003 American Chemical SocietyMetadata only available from this repositoryThis article was originally published in Langmuir - the Journal of the American Chemical Society in 2003. The full article can be found at http://dx.doi.org/10.1021/la0205304
Keywords: polyacrylamide solutions, viscosities, strain rate, coil stretch, Boger fluid
Divisions: ?? GlyndwrUniversity ??
Depositing User: ULCC Admin
Date Deposited: 05 Oct 2011 09:14
Last Modified: 11 Dec 2017 20:06
URI: http://glyndwr.collections.crest.ac.uk/id/eprint/259

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