Structure–Property Relationship of Cellulose Nanocrystal–Polyvinyl Alcohol Thin Films for High Barrier Coating Applications
| Autor: | Nuruddin, John A. Howarter, Reaz A. Chowdhury, Kendra A. Erk, Jeffrey P. Youngblood, Caroline R. Szczepanski, Ryan Szeto |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science 02 engineering and technology Polymer engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Polyvinyl alcohol 0104 chemical sciences chemistry.chemical_compound chemistry Coating Rheology Nanocrystal Chemical engineering engineering Copolymer General Materials Science Thin film Cellulose 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 13:12472-12482 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | CO2 and O2 gas permeability are paramount concerns in food packaging. Here, the permeability of cellulose nanocrystals (CNCs) and polyvinyl alcohol (PVA) coatings was explored as it relates to varied CNC content. Specifically, this work focuses on the role of PVA in rheology and barrier performance of the CNC films. Results show that shear-casted CNC films are transparent and have a high-order parameter, which is attributed to the shear-thinning behavior of the CNCs. The barrier performance of the CNC films improved because of the synergistic effect of having both alignment of CNCs and a lower free volume. The CNC-PVA films exhibited excellent barrier performance as compared to traditional engineered polymers, even much higher than high barrier ethylene-vinyl alcohol copolymer films. Furthermore, the moisture sensitivity of the films was greatly diminished with the addition of PVA. Overall, the results show applicability of CNC-PVA coating formulations for high barrier packaging applications. |
| Databáze: | OpenAIRE |
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