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Small strain deformation measurements of konjac glucomannan solutions and the influence of borate cross-linking

Ratcliffe, Ian; Williams, Peter A; English, Rob; Meadows, John

Authors

Ian Ratcliffe

Peter A Williams

Rob English

John Meadows



Abstract

The dynamic rheology of aqueous solutions of konjac glucomannan has been evaluated over a range of concentrations up to 2.35%, and the effect of borate cross-linking of such solutions evaluated in the range 0.02-40 mM borate. In preliminary work, conventional parallel plate geometries were employed and in situ cross-linking was investigated. For borate cross-linked samples a superior method, however, was found to be measurement of pre-formed cores of cross-linked polymer into which a four-bladed vane geometry was introduced. In order to compare with other associating polymer systems, rheological data were analysed by defining plateau moduli, corresponding relaxation times and zero shear viscosities and the scaling behaviour of these parameters with polymer and cross-linker concentrations was established. Maxwell fits and time-concentration superposition procedures were investigated. The rheological properties of the cross-linked polymer were shown to be the result of both increased network connectivity and retarded network dynamics.

Journal Article Type Article
Publication Date 2013-06
Deposit Date Apr 3, 2014
Print ISSN 0144-8617
Electronic ISSN 1879-1344
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 95
Issue 1
Pages 272-281
DOI https://doi.org/10.1016/j.carbpol.2013.02.024
Keywords Konjac glucomannan; Rheology; Borate; Associating polymers;
Public URL http://researchrepository.napier.ac.uk/id/eprint/6733
Publisher URL http://dx.doi.org/10.1016/j.carbpol.2013.02.024