Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 10, Pages 12472-12482Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c21525
Keywords
permeability; cellulose nanocrystals; polyvinyl alcohol; coating; barrier; alignment; film; packaging
Funding
- National Science Foundation Scalable Nanomanufacturing program [CMMI-1449358]
- Michigan State University
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The study found that CNC-PVA films exhibit excellent barrier performance, even higher than traditional polymers and high barrier ethylene-vinyl alcohol copolymer films. In addition, the moisture sensitivity of the films decreased with the addition of PVA.
CO2 and O-2 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.
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