photo-oxidation

photo-oxidation

a chemical reaction occurring as a result of absorption of light in the presence of oxygen.
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BASFs range of light stabilizers include UV absorbers that act by shielding the polymer from ultraviolet light, and Hindered Amine Light Stabilizers (HALS) that act by removing the radical intermediates formed in the photo-oxidation process.
Comparison of Oxidative Stability of Sesame (SesamumIndicum), Soybean (Glycine Max) and Mahua (Mee) (MadhucaLongifolia) Oils Against Photo-Oxidation and Autoxidation.
This prevents the melanin synthesis process and protects against photo-oxidation caused by UV radiation.
The techniques employed included chromic acid oxidation (CrA) (Masiello and Druffel 1998), high-energy ultraviolet photo-oxidation (PO) (Skjemstad et at.
Few publications have discussed about the photo-oxidation of PP in the presence of pro-oxidants [11].
The auto-oxidation and photo-oxidation susceptibility of vegetable oils is one of the biggest problems of vegetable oil processing industry (Choe and Min, 2006).
Degradation of polymeric coatings occurs chiefly through photo-oxidation processes as a result of long term exposure which produces cracks in surface morphology thus reducing barrier function of coating [22].
Photo-Oxidation Process-Application for Removal of Color from Textile Industry Effluent.
Based upon their structure and the functional groups comprising the polymer, some plastics are inherently susceptible to photo-oxidation.
Focusing on how the chemistry of a coating is broken down, such as through photo-oxidation and hydrolysis, creates a more realistic correlation between lab tests and field performance as it considers the effects on a binder's chemistry, the coating's formulation and weathering conditions.
TiO2 is commonly used as catalyst that utilizes the UV portion of the sun light spectrum to induce photo-oxidation and photo-reduction processes.
However, most of the research papers on this subjectsuggest that UV light induced decomposition and visible light-induced photo-oxidation are the two most important pathways of fading, as shown below: Dye + UV light BleachingDye + O2 + Light BleachingMany authors studied the chemistry andreactive speciesinvolved in photofading.