Innovative Design and Construction of Poly(Vinyl Alcohol) Coatings by Plant-Inspired Cross-Linking and Hydrogen Bonding Enabled Oil-Resistant and Strong Paper-Based Composites

Paper-based composites are extensively utilized in the packaging industry as ecologically sustainable and biodegradable substitutes. Nonetheless, the oil resistance of conventional poly(vinyl alcohol) (PVA) coated paper-based composites does not meet expectations. In this study, we developed a cost-effective paper-based packaging material with high performance and water and oil resistance based on the principles of bionic cross-linking and an innovative materials engineering approach. Results demonstrated a considerable improvement in the surface densification of the developed paper-based composite. The material exhibited a remarkably low oil absorption value of 0.51 g/m2, oil resistance of 7/12 kit rating, and a low air permeability of 0.48 μm/Pa·S. Moreover, the dry tensile strength of the material was 90.8 MPa, which was more than twice that of the original paper. The tensile strength of the material exceeded 30 MPa even under wet conditions. The material exhibited a Young's modulus of ∼10 GPa, which was considerably higher than that of traditional plastics. Furthermore, it displayed remarkable thermal stability and did not deform even at temperatures exceeding 120 °C. Given its performance, environmental benefits, and cost-effectiveness, this material offers a reliable solution for replacing plastic packaging materials.