Fully Biodegradable Lubricated Thermoplastic Starches: Water Desorption on Extruded Samples

The extrusion of 100mm wide by 500μm thick ribbons was achieved from native wheat starch, glycerol and vegetable oil blends. These ribbons enabled us to measure the variation of water content in our products under strict conditions of temperature and Relative Humidity (RH). Thus it appeared that the kinetics of water desorption depended on the nature of vegetable oil involved in the extruded formulation. As a consequence, all the vegetable oils did not present the same potentiality to produce hydrophobic starch‐based products. The distortion of these samples during thier conditioning prevented us from characterising the mechanical properties concerning the various extrudates.