Study on Preparation and Properties of Starch/Gelatin/Polyvinyl Alcohol Biodegradable Composite Films

As one of the four major materials in packaging industry, plastic packaging has been widely used in many industries. However, the traditional plastics have caused serious pollution and damaged the ecological environment. At present, the most effective method is to develop biodegradable packaging materials. In this study, using starch and gelatin as fillers and PVA as matrix, we prepared a new type of biodegradable composite films and studied their properties. When the mass fraction of starch and gelatin are 25% and 12.5% respectively, the mechanical properties, optical properties and water vapor barrier properties of the composite film are the best. The composite films exhibit excellent ability to block ultraviolet radiation and biodegradability, which can be used not only for light-sensitive food packaging, but also for green package.