Recyclable and Biodegradable Paper Coating with Functionalized PLA and PBAT

Area of Science:

• Materials Science
• Polymer Chemistry
• Sustainable Packaging

Background:

• Conventional polyester-coated paper is widely used for packaging but poses significant environmental challenges due to its non-recyclable nature.
• The persistence of non-biodegradable materials in packaging contributes to landfill waste and microplastic pollution.

Purpose of the Study:

• To develop novel, recyclable, and industrially compostable paper coating materials.
• To create a sustainable alternative to conventional non-recyclable polyester coatings for packaging applications.
• To ensure the developed coatings are free from harmful substances like PFAS and persistent microplastics.

Main Methods:

• Synthesis of carboxylic acid-functionalized polylactic acid (CPLA) and poly(butylene adipate-co-terephthalate) (CPBAT).
• Application of CPLA, or CPLA/CPBAT blends, as emulsified coatings onto paper.
• Comprehensive testing of coated paper for barrier properties, repellency, sealing, mechanical strength, repulpability, recyclability, and compostability.

Main Results:

• The functionalized polyester-coated papers demonstrated excellent water and oil repellency, gas and moisture barrier properties, and sealing capabilities.
• Certified testing validated the repulpability and recyclability of the coated papers.
• Industrial compostability of the coated papers was confirmed, and they were found to be free of PFAS and persistent microplastics.

Conclusions:

• Functionalized polyester blends provide a viable and sustainable solution for paper coatings.
• The developed coated paper meets performance requirements for packaging while aligning with circular economy principles.
• This innovation offers an environmentally responsible alternative to conventional coated papers, reducing plastic waste and promoting biodegradability.