Abstract
The distribution of wood preservative coatings in wood surface layer was assessed at the cellular level using confocal Raman microscopy. Raman images were created based on the fingerprint Raman bands of the different wood polymers and coating components (resin and pigment). The wood cell walls and the distribution of the resin and pigment were clearly visualized at the same time. It was concluded that confocal Raman microscopy is suitable for the evaluation of the microdistribution of wood coatings, providing valuable information for the improvement of wood coating technology.
Highlights
Wood products in outdoor conditions need to be protected from the effects of weathering and fungal decay [1,2]
It is known that weathering performance of wood coating systems is usually affected by the wood species, grain orientation, thickness of latewood bands, and moisture content [7,8]
The spectrum of the middle layer of the secondary cell wall (S2 ), which is distributed near the surface (Figure 1b), showed no additional bands than those attributed to cell wall polymers, such as cellulose, hemicelluloses, and lignin [35]
Summary
Wood products in outdoor conditions need to be protected from the effects of weathering and fungal decay [1,2]. The use of protective coatings on wood surfaces is an effective and simple way to improve their durability and performance. For long-term applications in outdoor environments, coating film defects, such as cracking and peeling, are unavoidable. Periodic maintenance is required, and many studies aiming to improve the service life of wood coatings have been performed [3,4,5,6]. It is known that weathering performance of wood coating systems is usually affected by the wood species, grain orientation, thickness of latewood bands, and moisture content [7,8]. The durability of wood surfaces may be improved when the light-shielding degree of the coating [9]
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