Preparation and Property Analysis of Biodegradable Packaging Film from Alginate, Starch and Citric acid
Abstract
In the present study alginate-starch blend films (thickness 0.08 mm) of different composition were prepared by casting and their mechanical properties were studied. Highest tensile strength was obtained for alginate: starch = 4: 1 of 70 MPa. To impart antimicrobial property to the alginate-starch films, citric acid of different composition was used and CaCl2 treatment of this film was performed to improve the stability of the films in water. Then the films were further modified with monomer, methylacrylate (MA) and gamma radiation. The blend films were soaked in different formulations of methylacrylate (MA), in methanol and then irradiated by gamma radiation. Mechanical properties of the modified films such as tensile strength and elongation at break were studied. Thermal properties of films were characterized by dynamic mechanical analysis (DMA). The structural and morphological features of films were investigated using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM).
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