| 초록 |
Polyvinyl alcohol (PVA) has an excellent gas barrier property because it can form a dense structure by strong intermolecular hydrogen bonding. However, it has a poor moisture barrier property due to its abundant hydroxyl groups on its side of backbone. In this study, alkylated graphene oxide (AGO) as a hydrophobic filler and dialdehyde cellulose nanocrystal (DCNC) as a cross-linkable nanofiller were incorporated to lower the solubility in water of PVA. DCNC was prepared through partial oxidation of cellulose nanocrystals. The solution of the PVA/AGO/DCNC was bar-coated on the surface of poly(ethylene terephthalate) film. The dispersion stability of the solution was confirmed by Turbiscan analysis. The composite barrier film reduced oxygen transmission rate by 90% and water vapor transmission rate by 15% compared to PVA barrier film. The crosslinking of PVA composite films with DCNC was also characterized through FTIR, TGA, and UV-vis spectroscopy. |
