Improved gas and water barrier properties of poly(vinyl alcohol)-based composite films with alkylated graphene oxides and crosslinkable nanocelluloses
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초록
내용
Poly(vinyl alcohol) (PVA) is a representative hydrophilic synthetic polymer and has an excellent gas barrier property as it can form a dense structure by strong inter-intramolecular hydrogen bonding. However, the low moisture barrier properties exhibited by abundant hydroxyl groups have limited the application of PVA as a packaging material. In this study, we sought to develop a PVA-based coating solution with improved hydrophobicity using a combination of hydrophobic and cross-linkable nanofillers. The exfoliated graphene was modified to give hydrophobicity by making alkylated graphene oxide (AGO), and dialdehyde cellulose nanocrystals (DCNCs) were prepared through partial oxidation of cellulose nanocrystals to induce crosslinking reaction with PVA. As a result, DCNCs not only can increase the dispersibility of AGO, but also form covalent bonds with PVA to maximize the moisture barrier ability of the PVA/AGO/DCNCs coating layer.