Abstract
Rheological measurements have been made on aqueous starch systems in which swollen granules are the dominant structural feature. An interesting cross-over phenomenon was observed. Low swelling starches have a lower viscosity than high swelling starches at low concentration; however, at high concentration this situation is reversed. This behaviour could be explained by a model which takes into account the existence of two concentration regimes. In the dilute regime the viscosity is governed by the volume fraction of swollen granules; in the concentrated regime it is governed by particle rigidity. Moreover, the dynamic loss angle and the shear thinning index were found to level off in the concentrated regime. Suspensions of swollen starch granules differ from starch solutions in a fundamental way. These differences are believed to have their origin in the static and motional characteristics of both kinds of system.
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