Hydration Properties of Extruded Starch Foams and Films
Résumé
The study focuses on hydration during immersion of extruded starch foams and thermomoulded starch films. A collection of starch foam samples from 1% to 70% amylose (99%–30% amylopectin) processed under various extrusion conditions has been used. The alveolar structures of foams are characterized by various densities (from 98 to 465 kg/m 3 ), cell size, and median cell wall thickness. The kinetics of water uptake are measured and fitted by using the Peleg model. It is shown that the larger the size of the alveoli and the thinner the walls, the greater the water uptake, whatever the amylose–amylopectin composition of the walls. The water uptake of films is controlled by the thickness of films (from 0.25 to 1 mm) and the amylose‐amylopectin composition, with a threshold value of amylose content between 40% and 50%.
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