Acetylated Wheat Starch Membranes: Permeability Measurements
Résumé
Packaging industries require new biodegradable food compatible films with low O2 permeability and controlled H2O flux. Biopolymers such as starch are chosen as raw materials because of their low cost, renewability, and local origin. The morphology and properties of these polymers can be affected by the humidity rate and it is important to know how moisture affects their gas permeability. In this study, wheat starch has been acetylated to a degree of substitution of 2.7 (1) and dissolved into chloroform with triacetin added as plasticizer (28 % by weight of membrane). Clear and bright films were obtained by the tape casting technique. Permeability measurements with water vapour were made and in addition, O2 and CO2 transport properties were studied for different relative humidity (R.H.) conditions in order to determine if gas selectivity changes with the hydration state of the film at 20°C.
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