Abstract:The theological behaviour of a molten maize starch in low hydrated phase was investigated using a pre-shearing rheometer. This apparatus enables one to impose well-characterized thermomechanical treatment on the product before viscosity measurement. The influence of temperature, moisture content and intensity of the treatment were studied. The theological behaviour of the maize starch may be described by a power law with exponential dependences on temperature, water content and mechanical energy provided to the product before measurement.

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The morphology of a polypropylene and polyamide blend has been investigated with the Rheoplast rheometer which allows us to apply a well defined thermomechanical history before the capillary flow. The polymer flow in the Rheoplast has been modeled using a homogenization hypothesis for the rheology. Correlations between the different observed morphologies and shear rates, elongational rates as well as dissipated energies are discussed.

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