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Advisor(s)
Abstract(s)
An investigation was carried out on the effect of the addition of galactomannans to pectin/calcium networks with different structural and rheological characteristics. For those pectin/calcium gels characterized
by an elastic equilibrium modulus, the addition of the galactomannan increased both the storage and loss mod&i, especially at short time scales. This increase was greater than that which could be expected by simple additivity of the viscoelastic properties of each isolated system. The pectin/calcium network remained the continuous gel matrix controlling the viscoelastic behaviour of these systems at low frequency. For
pectin/calcium systems close to the sol-gel transition or at low pH, the mixed systems evolved towards the behaviour of Viscoelastic liquids in the presence of increasing concentration of the non-gelling polymer. These overall results suggest that there is no specific interaction and that
the changes in the rheological properties of the pectin gels are due to galactomannan microphase separation limited by the entrapment of these macromolecules in the pectin-calcium network.
Description
Keywords
Citation
SILVA, J. A. Lopes da - Effect of galactomannans on the viscoelastic behaviour of pectin/calcium networks. Polymer Gels and Networks. ISSN 0966-7822. 4:1 (1996) 65-83
Publisher
Elsevier