Barrier Properties of Cellulose Nanocrystals -PVA Nanocomposites

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Paper and Packaging, Faculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), Karaj, I.R. Iran

2 Ph.D. Student, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran

3 Master of Science, Department of Paper and Packaging, Faculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), Karaj, I.R. Iran

Abstract

The aim of this study was to investigate the barrier properties of cellulose nanocrystals-PVA
nanocomposites. Nanocomposite films with different filler loading levels (3, 6, 9 and 12% by wt) were
developed by solvent casting method. The effect of cellulose nanocrystals on the barrier properties of
the nanocomposites was studied. To this end, moisture absorption, water vapor permeability (WVP),
oxygen transmission rate (OTR) and chemical vapor transmission rate (CVTR) of nanocomposite
films were measured. The results showed that adding cellulose nanocrystals improve barrier
properties, by reduction of the moisture absorption, WVP, OTR and CVTR of nanocomposites. These
improvements in the barrier properties of nanocomposites were attributed to the high crystallinity and
the strong interactions between the hydroxyl groups of cellulose nanocrystals and PVA chains,
indicating that the cellulose nanocrystals were well dispersed and adherent to the PVA matrix.
Furthermore, cellulose nanocrystals provide tortuous path for diffusing molecules to pass through the
film. Barrier properties improvement in fully hydrolyzed matrices was more significant than partially
hydrolyzed matrices.

Keywords

References

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Forest and Wood Products
Volume 67, Issue 3 - Serial Number 3
October 2014
Pages 517-528

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