Synthesis of Novel Biodegradable Starch Glycerol Compound instead of Polylactic Acid (PLA) to Biowastes and Plastics Recycling

Authors: Farbod Fakhimi kamal, Amirsoheyl Pirayeshfar

Company/Faculty/School: Allameh Helli 1 High School, Tehran, Iran

Country: Iran


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Biodegradable polymer compounds are highly regarded in Europe for their commercial use, more than 1 million tons per year. Among these materials, thermoplastic Starch compounds (TPS) are mentioned with suitable biodegradability due to hydrophobic structure, that according to DIN54900, their biodegradability has been fully proven. The first series of starch blends using polylactic acid (PLA) was evaluated by Bichoff and Walden in 1983 for their usability in the production of renewable packaging and bottles. In this research, a novel compound of starch using glycerol and acetic acid with chemical structures compatible with starch and its physical and mechanical properties have been evaluated as a suitable substitute of polylactic acid compounds. This mixture as PLA can be molded by continuous extrusion method and mineral salts such as egg shell can be used to increase the strength, and this is also a way to remove metal salts that pollute the environment. Although the elastic modulus of the eggshell is less than talc fillers e.g. in the polypropylene (PP) polymer blends, but it will increase the elastic modulus of such compounds higher. This effect has been investigated by evaluating the morphology of the present compounds through microscopic methods along with investigating strength and physical and mechanical properties along using carbon black fillers through black ink or other colors such as green ink within colorable polymeric specimens.