Evaluation of Surface Roughness Parameters of Graphene Oxide-Impregnated Wood Under Accelerated UV Ageing

This study evaluated the effect of modifying pine and birch wood veneers with graphene oxide (GO) and the duration of UV irradiation on roughness parameters (Ra, Rz, Rq). Surface roughness was evaluated in directions both perpendicular and parallel to the grain after 0, 16, 32, and 48 h of photoageing exposure. The study showed that the measurement direction was the main factor determining the values of the roughness parameters. The interaction between impregnation and UV exposure time was significant, indicating that the effect of UV radiation depended on the impregnation used. The roughness parameters for birch were relatively stable. In contrast, for non-impregnated pine, UV radiation caused an increase in roughness, particularly in the direction perpendicular to the grain. Graphene oxide impregnation altered the ageing course of the pine surface, resulting in reduced roughness parameters at longer exposure times.