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22 de abr. de 2020 · In laboratory testing, the team found that after 30 days of continuous UV light exposure, the polymer chains making up the plastic had degraded to one quarter of their original length. The end ...
16 de sept. de 2020 · This work deals with the effects of ultraviolet (UV) aging on polycarbonate (PC) properties. Thus, a PC was subjected to accelerated UV radiation with a wavelength range from 200 to 280 nm, at different times. Induced changes in the material were studied by UV–visible spectrophotometry, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction. The material surface was analyzed by ...
19 de nov. de 2019 · Ultraviolet rays are one of the causes of fading because they can break down chemical bonds and fade the color in an object. Other major contributors to fading include visible light and solar heat. Some objects may be more prone to this bleaching effect, such as dyed textiles and watercolors. Other objects may reflect the light more, which ...
1 de feb. de 2022 · In this paper, electrochemical-assisted ultraviolet light coupled peroxodisulfate system (E-UV-PDS) was used to degrade ciprofloxacin (CIP), and it was determined that electrolysis and ultraviolet ...
15 de feb. de 2022 · Abstract. The reactivity of peracetic acid (PAA) alone, and PAA exposed to ultraviolet radiation (UV), was investigated on Microcystis aeruginosa cells, and on microcystin-LR and -RR. Reaction rates between PAA and MC-LR (k = 3.46 M -1 s -1) and MC-RR (k = 2.67 M -1 s -1) were determined in an unbuffered acidic solution, and they are ...
La photodégradation est un changement chimique qui réduit la masse molaire du polymère. En conséquence, le matériau devient plus fragile, avec une réduction de sa résistance à la traction, à l'impact et à l'allongement. La décoloration et la perte de la surface lisse accompagnent la photodégradation. Les concentrations élevées de ...
Ultraviolet radiation from the sun damages human skin, resulting in an old and wrinkled appearance. A substantial amount of circumstantial evidence indicates that photoaging results in part from alterations in the composition, organization, and structure of the collagenous extracellular matrix in th …
