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Colloidal Nanocomposite Latex of Nanocellulose and Poly (Vinyl Acetate) for Sustainable Barrier Coatings: An Alternative to Non-Degradable Plastics
- Shahab Nasr
- Nanocomposites of latex and nanocellulose represent a significant advancement in material science. The research explores the semi-batch approach for the synthesis of colloidal nanocomposite latexes, facilitating scalability and reproducibility. The urgent need to replace non-degradable plastics with sustainable alternatives has driven research towards biobased and biodegradable materials. The colloidal nanocomposite latex demonstrates potential as a coating for barrier applications. We have been conducting research on scalability of manufacturing colloidal nanocomposites of vinyl acetate and cellulose nanocrystals. Chemical bonds between poly (vinyl acetate) and CNCs, stability, swelling, drying rate, water vapor transition rate, and topography of the final film have been investigated. The colloidal nanocomposite demonstrates potential as a coating on cellulosic substrates such as paper and cardboard. The colloidal nature of the nanocomposite allows for uniform coating deposition, ensuring consistent barrier performance across the substrate surface. Higher drying rate and lower water vapor transition rate for certain periods measured for nanocomposites. There was no obvious aggregation for CNCs which have been extracted through sulfuric acid hydrolysis. The reduction of hydroxyl groups showed successful bonding between CNCs and poly (vinyl acetate). Immersing the films of nanocomposites in water showed stability of the film, while poly (vinyl acetate) film disintegrated by water adsorption. Cellulose nanocrystals changed the surface topography of the films, and the roughness increases by increasing the dosage of CNCs. This research contributes to the development of eco-friendly alternatives to non-degradable plastics, paving the way for a more sustainable future.
