Research progress on photodiscoloration mechanism and functional regulation in wood

Abstract

Wood, as a naturally renewable material, possesses unique attributes such as distinctive grain patterns, a warm texture, and excellent workability. These features render indispensable in fields like construction, furniture making, and the creation of art objects. However, wood is susceptible to chemical degradation when exposed to sunlight, leading to surface discoloration, yellowing, and even structural damage. These issues not only severely affect its appearance but also significantly shorten its lifespan. Therefore, this paper investigates the mechanisms behind wood photodiscoloration, systematically analyzes internal factors such as species differences, types and content of extractives, moisture content, as well as external environmental factors including light intensity, temperature, and oxygen exposure. Furthermore, the paper reviews current functional improvement technologies, surface coating treatments, and surface modification of biomass photoprotective film. This work provides a theoretical basis for enhancing wood light resistance and developing efficient protective technologies.