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Preparation, Characterization, and Biodegradability Assessment of Maize Starch‐(PVOH)/Clay Nanocomposite Films

Katerinopoulou, Katerina, Giannakas, Aris, Barkoula, Nektaria‐Marianthi, Ladavos, Athanasios
DieStärke = 2019 v.71 no.1-2 pp. e1800076
biodegradability, biodegradation, clay, corn, corn starch, glycerol, mechanical properties, montmorillonite, nanocomposites, nanomaterials, plasticizers, polyvinyl alcohol, starch, thermal stability, water vapor
This study is focused on the preparation, characterization, and biodegradability assessment of clay nanocomposite films based on plasticized maize starch, prepared via solution casting method. Intercalated nano‐structure is achieved in all obtained films. Mechanical properties of the films prove to be dependent on the content of plasticizer (Glycerol) and poly‐vinyl‐alcohol (PVOH). Nanocomposite film with 10 wt% Glycerol and 20 wt% PVOH content possesses high stiffness and strength, but it is very brittle while nanocomposite film with 20 wt% Glycerol and 10 wt% PVOH content possesses reduced stiffness and strength but enhanced elongation at break, and film forming capability. Thermal stability of plasticized maize starch increases by 50 °C after addition of both PVOH and montmorillonite while water vapor transmission rate (WVTR) is reduced by 74% in comparison to the plasticized maize starch film. The biodegradation process increases in films with high starch content, while it is slow down when PVOH is added.