US20260227236
2026-08-06
Physics
G01J1/50
The invention presents compositions for detecting ultraviolet (UV) radiation, leveraging a self-healing elastomeric polymer, such as functionalized polyurethane. This polymer includes an electron donor functional group, like dynamic disulfide bonds, and a photochromic component that changes color upon UV exposure. These compositions are designed for use in products such as wearable devices, including wristbands, stickers, and patches, which can effectively monitor UV radiation exposure.
Ultraviolet (UV) light, with wavelengths between 100 nm and 400 nm, is a form of electromagnetic radiation that can be both beneficial and harmful. It is widely used in healthcare and industrial processes but poses health risks like skin damage and cancer upon overexposure. Current UV sensors are often rigid and fragile, limiting their wearable applications. The development of compact, robust, and self-healing UV sensors for wearable technology is highly desirable to provide real-time monitoring and protection against UV-induced health issues.
The composition comprises a self-healing elastomeric polymer with an electron donor functional group and a photochromic component. The polymer, often a polyurethane, contains disulfide groups, while the photochromic component may include substances like phosphomolybdic acid or spiropyrans. This setup allows for a reversible color change upon UV exposure. The composition is designed to be free of added dopants or catalysts, with the photochromic component making up 0.1% to 40% of the composition, and the polymer forming 60% to 99.9%.
Products utilizing this composition feature at least one detection region that changes color after UV exposure. These products may include reference regions for comparing exposure levels. The detection region is a composite material with the self-healing polymer matrix. Products are designed to be waterproof, battery-free, and reusable, capable of detecting UV exposure multiple times. Wearable forms such as stickers, wristbands, and patches are possible, providing visible color changes to the user.
The method for detecting UV radiation involves placing a product with a detection region in a UV-prone environment. The detection region, containing the composite material, undergoes a photochromic reaction facilitated by the electron donor group. This results in a color change indicating UV exposure. The method may include comparing the detection region's color with reference regions to assess UV exposure levels accurately.