The shear degradation of high-molecular-weight flocculant solutions

J.P. Scott; P.D. Fawell; D.E. Ralph; J.B. Farrow

doi:10.1002/(SICI)1097-4628(19961219)62:12<2097::AID-APP12>3.0.CO;2-3

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The shear degradation of high-molecular-weight flocculant solutions

Journal article

Peer reviewed

The shear degradation of high-molecular-weight flocculant solutions

J.P. Scott, P.D. Fawell, D.E. Ralph and J.B. Farrow

Journal of Applied Polymer Science, Vol.62(12), pp.2097-2106

1996

DOI: https://doi.org/10.1002/(SICI)1097-4628(19961219)62:12<2097::AID-APP12>3.0.CO;2-3

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Abstract

Solutions of polyacrylamide and poly(acrylamide-co-sodium acrylate) flocculants with varying molecular weights were shear degraded under a range of mixing conditions. The viscosity and flocculant activity of the solutions generally decreased with time to limiting values dependent on the mixing intensity. The activity of 10 and 20% anionic flocculants displayed quite different trends from those for nonionic flocculants of equivalent molecular weight, with less apparent degradation due to mixing, particularly at low dosages. However, viscosity measurements on sheared solutions diluted with a salt buffer suggest that nonionic and anionic flocculants with similar initial molecular weights were degraded to the same degree. Multiangle laser light-scattering measurements were used to confirm that the shearing process resulted in a reduction in molecular weight which was independent of anionic character. The apparent shear resistance of anionic flocculation mechanisms for the nonionic and anionic flocculants.

Details

Title: The shear degradation of high-molecular-weight flocculant solutions
Authors/Creators: J.P. Scott (Author/Creator) - A. J. Parker Cooperative Research Centre for Hydrometallurgy, School of Physical Sciences, Engineering and Technology, Murdoch University, Murdoch, WA 6150
P.D. Fawell (Author/Creator) - Cooperative Research Centre
D.E. Ralph (Author/Creator) - A. J. Parker Cooperative Research Centre for Hydrometallurgy, School of Physical Sciences, Engineering and Technology, Murdoch University, Murdoch, WA 6150
J.B. Farrow (Author/Creator) - Cooperative Research Centre
Publication Details: Journal of Applied Polymer Science, Vol.62(12), pp.2097-2106
Publisher: Wiley Periodicals, Inc.
Identifiers: 991005542753607891
Copyright: © 1996 John Wiley & Sons, Inc.
Murdoch Affiliation: Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 2 Chemistry; 2.90 Water Treatment; 2.90.1053 Coagulation-Flocculation
Web Of Science research areas: Polymer Science
ESI research areas: Chemistry