Surface Characteristics of Wood as They Affect Durability of Finishes. Part I. Surface Stabilization. Part II. Photochemical Degradation of Wood

摘要

The report considers the behavior of wood surfaces in exterior exposures with the object of improving the durability of clear finishes applied over them. Surface stabilization of wood was examined as a means for reducing strains to the covering film that are caused by movement of the wood substrate as humidity conditions change. Improved performance of a polyurethane and a polyacrylate emulsion finish were observed on wood surfaces that had been given various degrees of stabilization with a phenolic resin. The effect of light on wood was also studied. Exposure of wood to ultraviolet light caused the formation of volatile products of degradation. Changes in the chemical properties of the wood were also noted. The rate of formation of the volatile products was useful in evaluating the effectiveness of treatments designed to protect wood from degradation by light. (Author)