Abstract
The rheological properties of blends obtained by mixing alginate and karaya gum dispersions were described from oscillation, shear and creep experiments using a controlled stress rheometer. The mechanical spectra shown by such mixtures were strongly modified when compared with those of each of the blend components. It was found that the viscoelastic behaviour of mixtures was strongly affected by the age of the karaya gum. Contrary to that which is observed with fresh karaya gum, maximum synergy was observed with a mixture containing 75% aged karaya gum. It is suggested that mutual incompatibility between the two polysaccharides could explain the formation of a mixed network.
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