(585j) Sustainable Hydrophobic Paper Coating Using Esterified Lignin

The demand for sustainable alternatives to synthetic coatings in packaging has led to increased interest in lignin-based hydrophobic materials. In this study, kraft lignin is esterified with palmitic anhydride to form palmitoylated lignin, introducing long-chain hydrophobic groups while maintaining its ability to redisperse in water. This allows for the development of a water-based sprayable lignin coating for paper. The coated paper’s hydrophobicity is evaluated using water contact angle measurements via tensiometer, while surface roughness is analyzed using a profilometer. Particle size distribution is assessed through dynamic light scattering (DLS), and scanning electron microscopy (SEM) provides insights into particle morphology and paper surface structure. Additionally, nuclear magnetic resonance (NMR) spectroscopy confirms the chemical modifications in lignin. This study demonstrates the feasibility of achieving hydrophobic paper surfaces using bio-based coatings, offering a sustainable alternative to conventional synthetic treatments for applications such as packaging.