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Biodegradable PLA-PHA Polymer Blown Extrusion Processing Properties
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Researchers developed biodegradable PLA-PHA polymer blends for blown extrusion processing to replace conventional PVC-containing packaging materials that contribute to microplastic pollution, finding that adding plant-based PHA to PLA improved tensile strength by 32% and enhanced blown extrusion processability. The study demonstrates a viable biodegradable alternative for food and medical device packaging applications.
As delivery culture grows rapidly, global regulations on disposable products and packaging materials are being strengthened. The use of various chemical additives and polyvinyl chloride (PVC) plasticizers in the packaging material manufacturing process has been confirmed to cause water pollution and microplastics. Therefore, it is important to develop biodegradable packaging materials. When polybutylene adipate terephthalate (PBAT) is mixed with polybutylene adipate terephthalate (PLA), a biodegradable petroleum material, its applications in food and medical device packaging are limited owing to its low tensile strength and high opacity. However, the plant-based PLA composite material with added PHA exhibits excellent blown extrusion processability, improved tensile strength (MPa) by 32%, and improved transparency by more than 80%. Furthermore, in a comparative study, it was determined that the tensile strength of the composite material can be improved by 170% by changing the biodegradable mixing ratio. The composite material, which comprises PHA, is a white bioplastic known for its significant carbon reduction effect. It is expected to serve as a sustainable material for future generations.
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This review summarizes existing research on biodegradable food packaging films made from materials like starch, gelatin, and plant-based plastics, produced using a manufacturing method called extrusion blowing. It describes methods researchers use to improve these films' strength and moisture resistance, and notes that challenges remain in scaling up production affordably.
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