Nanocellulose-based UV-curable wood coatings deliver enhanced adhesion and durability

Researchers have developed a high-performance photocurable nanocomposite coating for wood surfaces, addressing the limitations of conventional UV-curable coatings. The innovative approach uses cellulose nanocrystals (CNCs) modified via atom transfer radical polymerisation (ATRP) to create a reinforced interface between the photopolymer and the wood surface. This modification not only improves compatibility but also forms a hydrogen-bond network and radical-initiated chemical linkages, substantially reducing internal stress and enhancing adhesion.

In comparison to traditional resin coatings, the CNC-based nanocomposite demonstrated remarkable improvements: hardness increased by up to 33.99 % (79 Shore D), adhesion strength nearly doubled to 11.38 MPa, and wear loss reduced by 43.6 %. The coating also exhibited excellent electrochemical corrosion resistance and UV stability, making it a sustainable solution for multifunctional wood coatings.

Event Tip: EC Conference Frontiers in Wood Coatings

TheEC Conference Frontiers in Wood Coatings, formerly the Wood Coatings Congress, has established itself as the international reference platform for scientific and technical exchange in the field of wood coatings. Over the course of two intensive days in Amsterdam, the conference will bring together stakeholders from across the value chain — from resin and additive producers to leading research institutes, coating manufacturers, and end-use industries — to discuss the latest advances in formulations, application processes, and sustainable solutions.

Enhanced performance through nanocellulose reinforcement

The ability of CNCs to act as interfacial molecular bridges allows for better mechanical interlocking and chemical bonding, overcoming the challenges posed by conventional coatings, such as poor adhesion and volume shrinkage. This dual enhancement mechanism not only reinforces the wood-polymer interface but also contributes to improved impact resistance and durability, critical for wood applications in demanding environments.

With its sustainable reinforcement method and multifunctional benefits, this CNC-modified photocurable coating represents a significant advancement in the field of wood coatings technology. It paves the way for eco-friendly solutions that combine superior performance with reduced environmental impact.

Source: Wang, Q., Yang, Z., Liu, X., & Feng, X., Construction of wood coatings based on nanocellulose photocurable composites and their enhancement mechanisms. Progress in Organic Coatings, 2025. DOI: https://doi.org/10.1016/j.porgcoat.2025.109820.

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