Chitosan-Microfibrillated Cellulose Interactions: Fundamental Insights for Enhanced Barrier Coating Applications, Advanced Coating Symposium (TAPPICon26)

This study investigates chitosan (CH)-microfibrillated cellulose (MFC) interactions to advance the development of high-performance barrier coatings. Composite coating formulations were prepared by dissolving CH in acetic acid with glycerol as a plasticizer, followed by incorporation of MFC derived from bleached hardwood kraft pulp at varying loadings. The addition of MFC significantly enhanced mechanical strength and improved water vapor and oxygen barrier performance, while influencing solids content, pH, and rheology of the coating system. Colloidal stability analysis revealed that dispersion behavior of MFC within the CH matrix is governed by surface charge interactions, directly affecting suspension stability. FTIR and XPS analyses confirmed the presence of strong intermolecular hydrogen bonding between CH and MFC, which contributes to improved structural integrity and coating performance, particularly at optimal MFC loading. These findings provide fundamental insights into CH-MFC interactions, enabling the rational design of sustainable barrier coatings with enhanced functional properties.

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