(81g) Development and Characterization of Biopolymers Coated PET Film for Packaging Applications

Polyethylene terephthalate (PET) is one of the most widely used packaging materials in food and beverage industries, as well as, in cosmetics and other personal care items. However, the product shelf life is related to the gas transmission rate of PET and decreasing the gas transmission rate further can improve packaging performance. Modification of physical and chemical properties of PET can expand food and cosmetics shelf life.

In this study, we are coating PET with different types of carbohydrate-based biopolymers blended with binder adhesives to improve its barrier performance. Different variables, such as, coating type, coating thickness, solid concertation, adhesive types and concentrations are studied. A significant question is whether these biopolymer coatings are compatible with PET film, since mechanical and thermal changes can lead to defects and biopolymers tend to delaminate when coated on a PET substrate due to weak interfacial bonding. Herein, a robust coated layer has been developed on the PET surface to maintain coated surface adhesion to the substrate under mechanical and thermal stress. The coated PET film significantly reduces the oxygen transmission rate compared to the substrate making it a competitive alternate to the currently available packaging options. Additionally, the film is designed for recyclability, helping to reduce plastic waste pile up. The developed material system can be applied for different packaging applications to extend product shelf life while maintaining environmental sustainability.