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

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 degrees 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.