photodegradation

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photodegradation

[¦fōd·ō‚deg·rə′dā·shən]
(organic chemistry)
Chemical changes resulting from the absorption of light that reduce the useful properties of materials, particularly polymers. The chemical changes can include bond scission (especially of the molecular backbone), color formation, crosslinking, and chemical rearrangements.
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References in periodicals archive ?
Calcium ions have been shown to enhance the photo-degradation of tetracycline HCl under simulated sunlight (55), a point of particular relevance given the calcium ion content of saliva, in the situation of coronal leakage.
Hsuan, "Assessing the photo-degradation of geosynthetics by outdoor exposure and laboratory weatherometer," Geotextiles and Geomembranes, vol.
Halley, "Effect of soil environment on the photo-degradation of polyethylene films," Journal of Applied Polymer Science, vol.
Saadeddin et al., "CdS-sensitized Ti[O.sub.2] in phenazopyridine photo-degradation: catalyst efficiency, stability and feasibility assessment," Journal of Hazardous Materials, vol.
Thabet, "Photo-degradation of acid green dye over Co-ZSM-5 catalysts prepared by incipient wetness impregnation technique," Journal of Hazardous Materials, vol.
Forced degradation study was conducted by exposing samples of the drug substance and drug product to various stress conditions of hydrolysis, oxidation, photo-degradation, and thermal stress; the time and conditions are illustrated in Table 2.
The photo-degradation was faster than pure polymer and composite without pro-oxidant till 5% filler content, after which increasing amount of filler did not affect the photo-oxidation behavior.
The Fig shows that the Kinetics of CLF decomposition well fits pseudo first- order reaction rate and photo-degradation of CLF was enhanced in the presence of TiO2 / Ti catalyst.
In order to assess the photocatalytic performance of the doped and undoped Ti[O.sub.2] samples under visible and UV light irradiation, the photo-degradation of MB as a model dye has been performed.
Some of the potential problems from containers include sorption, extraction, permeation, photo-degradation, and polymer modification.
These studies show that chemical bonds break and the lignin content of wood decreases as a consequence of photo-degradation. New chromophores form as exposure time is increased (George et al.
Contract Awarded for Identification and quantification of molecular species from the photo-degradation of insensitive munitions