Fotodegradaatioon
Fotodegradaatioon, commonly referred to as photodegradation, is the chemical and physical alteration of materials caused by exposure to light, especially ultraviolet (UV) radiation. It can occur through direct photolysis, where bonds in a molecule absorb light and break, or through indirect processes such as photooxidation, in which light-activated species like oxygen radicals attack the material. Reactions may produce discoloration, surface cracking, embrittlement, reduced mechanical strength, and changes in texture or gloss.
Mechanisms involved include the absorption of photons by the material or by photosensitizers, followed by energy
Factors affecting the rate include light intensity and wavelength distribution, exposure duration, and the presence of
Applications and implications span material design, product aging, and environmental remediation, where photocatalysis (for example, using