Bioinspired natural wax- cationic nanocellulose coated paper:improving barrier properties

• Grant number: 23/16370-3
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: August 01, 2024
• End date: July 31, 2027
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Juliana da Silva Bernardes
• Grantee: Maria Clara dos Santos Oliveira
• Host Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia e Inovação (Brasil). Campinas , SP, Brazil
• Associated research grant: 21/11967-6 - Center of Sciences for the Development CCD - Solutions for post-consumer waste: packaging and products, AP.CCD

Abstract

In recent years, the interest in replacing petroleum-derived materials has been driven by the need for sustainable products and processes with low environmental impact. Currently, the packaging sector contributes the largest share to the production and generation of plastic waste. Paper packaging emerges as a promising renewable and biodegradable alternative in this context. However, it faces challenges related to its intrinsic properties, particularly in terms of water, oxygen, and oil barrier properties. This limitation is commonly addressed by employing coatings that compromise the biodegradability of paper. In this regard, biomacromolecules such as polysaccharides and lipids are sustainable candidates for coating this material. In this project, the combination of cellulose nanofibrils (CNFs) and waxes will be explored in a bio-inspired manner, mimicking hydrophobic surfaces found in nature to enhance paper's water and oxygen barrier properties. Micro/nano hydrophobic structures with wax will be produced using two methodologies. The first approach involves the deposition of CNF-stabilized wax emulsions with the formation of wax globules. Additionally, micro-molding methodologies will be developed to produce waxy microstructures on CNF deposited on the paper surfaces. Besides advancing colloidal knowledge of emulsions and microfabrication techniques, the obtained results will enable the production of efficient and environmentally friendly paper packaging coatings to be applied as packaging for food and cosmetics.