Explanation

The change of materials properties with time under light. During the use of materials, sunlight is a common environment. During the long-term use of macromolecule materials such as plastics and coatings exposed to sunlight, discoloration, bubbles, pulverization, cracks, shedding and other phenomena often occur, which belong to the category of light aging. light aging is essentially a degradation reaction. When the irradiated light energy is greater than the bond energy of the chemical bond, the chemical bond will fracture, leading to changes in physical chemistry properties. Most macromolecule materials will experience different degrees of aging under the irradiation of light sources at the wavelength of 230-447nm. In the research and development of new materials, the methods of artificially accelerating light aging are often used, including the use of artificial light sources such as carbon arc lamps, fluorescence ultraviolet lamps, xenon arc lamps, metal halide lamps, etc. to simulate the sunlight environment and study the changes in the properties of materials.

Classification